FBgraph is a library that allows developers to easily access the Facebook Graph API using Node.js. Users can read, search, delete, and publish data to the Graph API, as well as perform FQL queries. All calls made using FBgraph will return JSON.
Google has long fielded complaints of sign-in requirements associated with Google Play Games. The Google+ requirement and multiple sign-ins required for multiple games has been a hotbed of frustration. Google announced the end of both requirements as part of a Google Play Games API model change.
If you are looking to display social networking statistics on your site, Shared Count just showed up with about the simplest tool you could ask for. Given a URL, the Shared Count API will contact the APIs of Facebook, Twitter, Google Buzz, Digg, Delicious, and StumbleUpon to retrieve their statistics.
It's a little bit creepy, but it's also a little bit genius. Singles for Foursquare builds a dating and messaging service on top of the location-sharing application. The result is a mashup that could match up hip iPhone-using, Foursquare-playing, same-bar-going early adopters.