LinkedIn, the social networking site for professionals, added apps to its site that allow members to collaborate on projects, gather and share data.

Applications include:

Blog Link. Cull the latest blog posts from your networks. If you're using WordPress, your own blog posts can be synced to your profile.

Store and share key documents such as current work, past deals, or a portfolio with Box.net, and Huddle Work Space enables LinkedIn connections to collaborate with each other on a created "project." (Another notch in the belt for cloud computing.) For sharing Powerpoint with a network, there is Slideshare and Google Presentation.

Amazon Reading List. Like GoodReads, this enables users to see what their peers are reading.

My Travel by TripIt helps users find colleagues that might be traveling to the same city by displaying travel plans on the profile.

To find out what customers are saying about your company, track messages on blogs, Twitter, and the internet with Company Buzz.

The platform is not open to developers. Instead, LinkedIn will review requests for new apps and add them if they "provide clear business utility" to users, writes Search Engine Journal.