Over fifty million users entrust their professional identities and relationships with LinkedIn, helping build LinkedIn into the largest global professional network today. However, professionals around the world use a wide variety of applications and Web sites to get their work done, and they have spoken loud and clear that they want the ability to leverage their professional networks wherever they work.

Starting today, developers worldwide can integrate LinkedIn into their business applications and Web sites. Developer.linkedin.com is now live and open for business.

The evolution of the LinkedIn Platform

Over the past months, LinkedIn has supported integrations with some of the most prominent and critical software applications in the enterprise. Partnerships with companies like IBM, Blackberry (Research in Motion), and most recently Microsoft, have given us time to invest in both functionality and scalability of the platform.

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oftware is moving to the cloud, and business applications need context for who people are and how they are related. LinkedIn now is the obvious choice as a provider for those services. It is hard to imagine a business application that would not benefit from LinkedIn integration.”

– Roger Neal, SVP/GM at BusinessWeek Digital, McGraw-Hill

At LinkedIn, we have always believed that business applications are better when they are built over a platform of professional reputation and relationships. In real life, our most valuable professional assets are the skills and experience we acquire and the trusted relationships we build. It’s not surprising that business software becomes more productive and valuable when it is built over these services.

How can I start developing for the LinkedIn Platform today?

Registering as a LinkedIn developer is as simple as filling out a form on developer.linkedin.com. The LinkedIn platform leverages the open OAuth standard to make integrations from almost any language and development environment as simple as possible.

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hat a breath of fresh air. We were able to go to http://developer.linkedin.com, request a key, and actually write functioning code in less than 15 minutes. It’s amazing to have access to such a powerful platform on tap at any time.”

– Iain Dodsworth, Founder and CEO of TweetDeck

A number of developers who have helped provide us with feedback and guidance in our development will be announcing integrations in the coming weeks. For example, TweetDeck is announcing full support for the LinkedIn platform in its next version. Now you can easily view or take action on your LinkedIn network updates from within TweetDeck, with the full integration of the LinkedIn profile information of the person who posted the update.

This is the beginning of a new set of opportunities for the LinkedIn platform, and we look forward to seeing the integrations that developers will launch in the coming weeks and months.

Stay tuned for additional enhancements over during the coming months as we learn and grow this platform together.

Today, Microsoft announces an exciting new addition to the upcoming Microsoft Office 2010 – the Outlook Social Connector. The Outlook Social Connector is designed to seamlessly bring communications history as well as business and social networking feeds into your Outlook experience.

LinkedIn will be the first networking site to support the Outlook Social Connector. The LinkedIn functionality will be available in early 2010. Our big belief is that you can be much more effective if you have your professional network close at hand, and you can leverage your online identity in the work you do on a daily basis. The Outlook Social Connector will bring your LinkedIn Professional Network to where you work – right within your e-mail inbox.

Here are three key benefits you get from this integration:

1. Keep up with LinkedIn connections right from your e-mail inbox

One of the great things about LinkedIn is being able to learn what your professional connections are working on and thinking about. Just glance at the Network Updates on your LinkedIn homepage and you’ll be able to learn what articles & books your connections are reading, what conferences they are attending, and what questions they are asking and answering on LinkedIn. Many use this information to keep current with their industry and profession, as well as to learn new things and expand their horizons.

The Outlooks Social Connector makes this even easier – by automatically showing the latest activity (i.e. Network Updates) from any LinkedIn connection that sends you an e-mail. So now you can get the latest information from your LinkedIn network even without having to leave your inbox.

What’s more, for any connection with a public LinkedIn profile photo, you’ll even get to see their picture as you communicate.

2. E-mail your LinkedIn connections directly from Outlook

Know that perfect LinkedIn connection to help you with a business task or question but don’t remember their current email address? No longer do you have to go to the LinkedIn website to find their contact information before sending them a message, as your LinkedIn network is now available right within your inbox.  Just start typing the name of a LinkedIn connection in the “To:” field of an Outlook message and the connections’ e-mail address from LinkedIn will automatically appear as if they are an existing Outlook contact. In fact, the Outlook Social Connector will create an Outlook Contacts folder for all of your LinkedIn connections and bring down their contact information, professional details, and picture from LinkedIn into Outlook.

3. Keep building your professional network from Outlook

Working with someone new but haven’t had a chance to connect with them on LinkedIn? By bringing professional networking to where you work, the Outlook Social Connector again makes it easy. Just click a button next to any e-mail you receive and instantly send an invitation to connect to the e-mail’s sender. It’s that easy.

We hope that these functions start bringing some of the key elements of your LinkedIn professional network to where you work – your Outlook e-mail inbox, sometime early next year. But these are certainly just the first steps. Let us know what else you’d like to see by leaving a comment below.

Last week LinkedIn launched a significant integration with Twitter, enabling professionals to expand their personal brands to their professional networks and vice-versa. To show our users how that might work, today we’re asking you: What’s the best business advice you’ve ever received?

The best business advice I ever received seemed to be something of an oxymoron. As an entrepreneur, you’re told frequently, “Be persistent! Follow your vision! Flatten obstacles!” But on the other hand, you’re urged to “Learn from the market! Adapt to changing conditions! Take a different course!” Knowing when to persist and when to be flexible is more of an art than a science. So in a fluid, fast-changing world, sometimes you stick to your vision, and sometimes you adapt quickly.

Unfortunately, that’s more than 140 characters! So watch the video to see how Biz and I resolve our best advice to the unique Twitter format. And tweet your best advice today with #in.

Here’s how you can share the best business advice you’ve received on LinkedIn and Twitter

1. LinkedIn and Twitter users can participate by tweeting the best business advice they’ve received with the hashtag #in.
2. If you’ve already linked your accounts, this hashtag will automatically update your LinkedIn status, enabling you to share your wisdom with both networks simultaneously.

[Ed. note: This is the first in a series of posts on LinkedIn around the world. We just announced LinkedIn's country manager in India - Hari V. Krishnan - and here are his initial thoughts as he visits our Mountain View headquarters this week]

I am truly excited about my new role heading up LinkedIn India – a platform which has been an integral part of my own career. The Indian internet has grown strongly and changed dramatically over the last 5 years with social media, e-commerce and advertising all beginning to come of age.  Having witnessed the change first hand working with leading companies like MySpace and Yahoo and start ups like Travelguru, I see the need to share knowledge assuming a more central role in sustaining the growth. I’m convinced that LinkedIn will play a strong role as a platform for sharing connections and knowledge.

India is the largest democracy on earth and one of the fastest growing economies globally. We have a large, skilled workforce and in the recent past our IT, services and telecommunications businesses have given us global acclaim. With the internet helping to shrink the world, Indians have already started developing their global connections. On LinkedIn, we already have over 3.4 million members from India and we continue to add 70,000 new users every week!

In the coming years I believe talent, professionalism, collaboration and networking will play an increasingly important role in sustaining India’s position in the global economy. The years ahead will also be full of great learning and growth for India’s professionals.

As I conclude my visit to LinkedIn, here in Mountain View, the excitement for the future of India and global professional networks is palpable. The pumped-up planning discussions and smiles (and lack of yawns) at every meeting, tell me we are excited to meet the challenges ahead. I look forward to linking up with many of you when I’m back in Mumbai. See you soon!

As you’ve likely heard by now, we launched our first Twitter integration features at LinkedIn earlier this week.  For professionals who want to make Twitter part of their professional identity, you can now easily add your Twitter account to your LinkedIn profile, and seamlessly post LinkedIn status updates to Twitter, and vice-versa.

This launch also brings with it a brand new addition to the LinkedIn application platform: Tweets.

Tweets is an application that allows you to seamless integrate basic Twitter functionality into your LinkedIn experience.  For our users who are regular users of Twitter, Tweets provides the following:

• Twitter client functionality, right from your LinkedIn homepage. Tweets adds a module to your homepage that allows you to easily see the most recent tweets of the people you follow on Twitter.  You can also easily reply to each tweet, or retweet it. Better still, you can even share it with your LinkedIn connections.

• Add your recent tweets to your LinkedIn profile. Tweets adds a module to your profile that shows your Twitter account and most recent tweets with a rich, compelling presentation.  You can easily choose to either display your most recent tweets, or only those tweets which feature the #in or #li hashtags.

• Easily browse the tweets of people you follow. Once you click through into the Tweets application, you can easily click on any Twitter user name, and view the most recent tweets of that user.

Next week, we’ll be adding Tweets to the Application directory on LinkedIn.  For the time being, if you’re interested in giving Tweets a try, here is the link to the Tweets installation page.  It’s also available from the “Add Application” menu on the homepage.

Tweets joins its sibling application, Company Buzz, the most popular application to date on the LinkedIn platform.  Company Buzz makes it simple for professionals to easily keep track of what people are saying about their company, products, competitors, and partners in real time by monitoring saved Twitter searches.  Together, they are a powerful set of tools for professionals to make monitoring Twitter a part of their LinkedIn routine.

Over the next few weeks, we’ll be adding additional functionality to Tweets to make it as easy as possible for LinkedIn members to find and follow people on Twitter.  We hope you enjoy this new addition to the LinkedIn application platform.

Today we’re announcing a partnership between LinkedIn and Twitter – and new features that we think are going to make both Twitter and LinkedIn more powerful for you. 

The idea is simple: When you set your status on LinkedIn you can now tweet it as well, amplifying it to your followers and real-time search services like Twitter Search and Bing. And when you tweet, you can send that message to your LinkedIn connections as well, from any Twitter service or tool.

Why? Because when you’re trying to get something done, you want Twitter and LinkedIn to work together. Like peanut butter and chocolate! Or at least that’s what Biz and Reid think:

LinkedIn has always been about helping you to build your professional identity on the web. The many elements that make up your online professional brand range from your LinkedIn profile to the many professional conversations you’re a part of. Status has proved valuable to our users, from finding new assignments and jobs to kick-starting a global business enterprise.

Now you can amplify those messages by broadcasting them to your audience on Twitter.

How does LinkedIn work with Twitter?

The feature is now available to all of our users, and with today’s launch, we’re making that two-way communication between your status updates and tweets a breeze to set up. Here’s how it works:

1. On LinkedIn

Want to share some interesting ideas about an industry-specific article you’ve just read with an even broader audience? Or how about letting people view your Twitter account name on your LinkedIn profile? Begin by joining your LinkedIn and Twitter accounts in just a few clicks. All you need to do is check the Twitter box under your Network Updates box on the homepage and follow a few simple steps.

Syncing your LinkedIn and Twitter accounts

Clicking through the setup process will allow you to specify the Twitter account that you’d like to sync and/or display on your LinkedIn profile.

Display Twitter on your LinkedIn profile

2. On Twitter

As a professional online and in the real world, you’ll often find articles or think of ideas that would be useful to share with your Twitter followers and your LinkedIn connections. It’s about sparking interesting conversations. Now you can share from anywhere. As part of the setup process, you can choose to either send all your tweets or select tweets from Twitter back to LinkedIn as a status update.

Share tweets as your LinkedIn status

If you pick the latter, don’t forget to add the #li or #in hashtag to every relevant tweet you’d like to send back to LinkedIn. Here’s a good example:

Include #in with any tweet to post as your LinkedIn status

So go ahead and get started. Link your LinkedIn and Twitter accounts today to add a new dimension to your professional conversation.

This morning, at the BlackBerry Developer Conference in San Francisco, I have the great pleasure of announcing one of our most important mobile efforts for 2009: the launch of LinkedIn for BlackBerry.  Needless to say, this launch has been hotly anticipated by the millions of LinkedIn members who make the BlackBerry their mobile business platform of choice.

LinkedIn for BlackBerry: Home

Imagine walking into any interview, any customer engagement or client meeting with the ability to look up the details on over 50 million professionals worldwide, in real-time.  Soon this will be a reality, as this application will bring the powerful capabilities of LinkedIn to your BlackBerry.

LinkedIn for BlackBerry: Search

LinkedIn for BlackBerry: Profile

We’ve worked hard to develop an application that takes advantage of the unique capabilities of the BlackBerry platform.  LinkedIn for BlackBerry will also include deep integration with the native Messages, Contacts & Calendar applications on the BlackBerry platform.  For example, here is an early screenshot of the native BlackBerry Messages application, with LinkedIn invitations and one-to-one messages integrated into the inbox:

LinkedIn for BlackBerry: Messages

LinkedIn for BlackBerry will join our existing suite of mobile products by the end of this year, marking the next step in our continuing effort to bring LinkedIn to wherever you work.  This is just the beginning – expect continued enhancements and expansions of the LinkedIn mobile platform in 2010.

See you at the BlackBerry Developer Conference 2009. To stay updated on BlackBerry developments, join the LinkedIn for BlackBerry Group.

And, if you’re one of our users who can’t wait to find out when the application will be ready for install, just email blackberryapp@linkedin.com to receive a notification.

A couple days ago, we launched several new features aimed at enhancing the professional conversation in LinkedIn groups. We call one of those features “following”.

Following makes it easier for you to see contributions made by your connections and other people you value within your groups. To get you started, you’re already following all of your connections and they’re following you. But it doesn’t stop with your connections: to follow someone who is not a connection, just click “Follow Their Name” under their name on a discussion page or on the Member page in your group.

Now when you go to your My Groups page, you’ll see updates about what the specific people you’re following have contributed to the groups you share. Updates from the people you’re following (and your updates to the people who are following you) also appear on the Overview page of each group you share. All of this makes it faster and easier to interact with your own personal “group within the group.”

For more information about Following, check out our FAQ.

Go ahead, check out your groups and start following!

Some of you may have noticed a new site navigation experience on LinkedIn.  We are in the process of testing a new design.  During this testing phase, some users will see the new design, while others will not.

What’s New

1. A global navigation bar at the top of the page that provides convenient access to all LinkedIn services.
2. Simplified local navigation within each of the LinkedIn areas (Profile, Contacts, Groups, etc.).
3. More room available for page content. Less scrolling.
4. A cleaner, less-cluttered look.

An easier way to navigate and find information on LinkedIn

We began the redesign effort several months ago by analyzing how people use LinkedIn.  We looked at what features people use the most and pored over several years of data from usability research on the site. Armed with this information we began doing design explorations of how to better organize LinkedIn features, and make them more convenient to find and use.

We factored into this effort additional features we knew were coming. We narrowed down the designs to a few candidates we felt were strong contenders. We then prototyped these designs and had users perform tasks with the prototypes in the usability lab. We went through numerous iterations until we arrived at a design we felt worked the best.  One of the key features of the new design is that it allows much more space for page content – information about you and your professional network.

We are now doing limited testing of the new design. We are still iterating and would love to hear your feedback!  Please consider this blog post one of the many ways to let us know what you think.

Feel free to either leave a comment at the bottom of the page or @linkedin us on twitter as well.

Code Alert! This is a part of our continuing series on Engineering at LinkedIn. If this isn’t your cup of Java, check back tomorrow for regular LinkedIn programming. In the meanwhile, check out some of our recent feature announcements, tips and tricks, or success stories.

I have the honor of presenting my talk entitled “Empowering the Social Web with Apache Shindig” at the 10th annual Apache Conference this week. I’ll talk about how Apache Shindig and OpenSocial standards power our very own LinkedIn InApps Platform and hundreds of other social containers on the web. Read on for more, but first a minor digression on LinkedIn, the Apache Software Foundation, and Open Source.

LinkedIn Runs on Apache

The Apache Software Foundation was founded in 1999 to foster development of the open source Apache HTTP Server —  which powers millions of web sites worldwide. Based on this success other projects were added over time. Each project is able to take advantage of the technical, legal and organizational resources provided by Apache. Today there are hundreds of high quality projects under the Apache umbrella.

The high quality and open nature of Apache software is in heavy use at LinkedIn. Many of our servers run Apache Tomcat. We build our software with Apache Ant and Ivy. Diverse and useful libraries such as Apache HttpClient, Commons, and Lucene  provide great functionality for Linkedin with less effort. This allows us to focus on what we do best — providing a great web experience to our members.

Leveraging Apache software is only the start. LinkedIn actively contributes code, design and testing to many Apache projects. These efforts insure that these projects continue to grow and evolve to meet our future challenges. In addition to our contributions to Apache Shindig you’ll find LinkedIn active in the Apache Lucene community where we’ve developed a number of extensions to this powerful search technology. LinkedIn code provides faceted search via bobo-browse, real time indexing with zoie, and extra performance with the kamikaze search extension. We’ve also released our data storage solution, Voldemort with an Apache License.  (Read more about Voldemort here)

Shindig, powering InApps at LinkedIn since 2008

At ApacheCon I’ll be talking about Apache Shindig, a framework that renders InApps like LinkedIn Events, Amazon Reading List, Tripit and 8 other applications. Shindig converts these applications into web content on the home page, profile page and full page views. The Shindig REST API allows our internal and external developers to access data using the OpenSocial and the Portable Contacts standards.

During the past months our involvement with Shindig has reaped benefits for LinkedIn Members and the developers we partner with. We incorporated numerous performance enhancements that have sped up page load times for InApps. These recent updates also include support for OpenSocial 0.9 which allows for easier, faster development of applications. New features include OpenSocial Templates, a new lightweight JavaScript API and “Data Pipelining” which reduces page load time. By applying these new features the applications such as Company Buzz now load much faster.

Over this same time period LinkedIn has contributed back to the Shindig and OpenSocial community. Our diligent QA teams have helped to find and fix cross-browser compatibility issues. Code contributions have flowed steadily back to the project. And we continue to work with the community to build and release the next version of Shindig, version 1.1, and future versions targeting the upcoming OpenSocial 1.0 standard.

Doing More, Learning More

At LinkedIn I’m proud to have witnessed our numerous contributions to the open source and Apache communities. By collaborating with our peers we have achieved much more than going it alone.

If you’re interested in learning more about Shindig and OpenSocial you can still register for ApacheCon and see my talk. If a more informal setting is to your liking you can attend the free Apache Social and Widgets Meetup this Thursday, November 5th 2009, which is sponsored by LinkedIn.