Facebook SDK for Android integrates with Facebook with the aim to build social apps and engage audiences. This SDK requires Android API level 9. It offers bolts, audience network, and Facebook packages. Android SDK includes login, app events, share, ads, custom stories, graph API, app links, send request, and app center. The particular functionality of each feature aims to enhance development experience. For example, app events measure the effectiveness of an application according to users' behavior; ads can increase user engagement via news feed; custom stories show how to use the Object API; and app links allows to handle incoming links to redirect users to an application using shared posts, stories, and requests.
There are many ways for websites to tap into online social networking services to allow their users to connect with each other. Now, for publishers who want to add social network functions to already existing websites, Yahoo! has announced their new Updates API, a web service that provides permission-based access to the actions of any user with a Yahoo! account. As part of Yahoo!'s Open Strategy (Y!OS), this API essentially allows developers to treat the Yahoo! network as a social networking platform (for more on Y!OS see our coverage of the initial Y!OS announcement and their YQL launch).
Discussion of Google's recent acquisition of Jambool has largely centered around its virtual currency platform, Social Gold. The power behind that platform comes in the form of the Social Gold API. Again, Google has bought a company whose API is central to its success.