With Twitter4J, you can easily integrate your Java application with the Twitter service. Twitter4J is an unofficial library.
Reusable instrument for simple sharing with popular social networks (Facebook, Twiiter).
JTwitter is a small library providing easy access to the Twitter API. Set and get your status, manage your network of friends, message friends, maintain lists, etc.
Facebook SDK for Android. Integrate with Facebook to help you build engaging social apps and get more installs.
Library for easy work with Facebook, Twitter, LinkedIn and Google on Android.