This unofficial Twitter Ruby gem is in its 5th version, and is heavily supported with documentation and code examples. Twitter Ruby Gem allows users to follow a user, retrieve a user name, fetch a timeline of tweets by a user, and many other functions. In this version of the gem, Twitter Streaming API is also experimentally supported.
We all know we can search web pages for text, but many services are looking to go above and beyond with features like location and face tagging. The big downside to these features is that they rely on end users have to manually enter in the appropriate data. Really, when was the last time you tagged all the people in the 200 photos you just uploaded to Facebook? To help automate the process of face recognition, face.com have just opened their API.
Idiligo is a web service that aims to make the lines of communication between businesses and customers more streamlined and effective. The company achieves this by providing an online platform that combines real-time video, chat and document sharing that can be a useful tool for things like remote meetings and presentations. The Idiligo Inside API is available to developers who wish to integrate this functionality with other websites and applications.
For the developer seeking to experiment efficiently with social APIs, O'Reilly's 2nd Edition of "Mining the Social Web" is a truly outstanding resource.
Author Matthew A. Russell drops the developer right into the sandbox of each social network (Twitter, Facebook, LinkedIn and Google+ are particularly emphasized, as you would expect) with just the right amount of explanation about what's accessible via each dataset, and then clears out all the obstacles so they can start data mining against very clear examples.