OpenIntents

SocialAuth Android is an Android version of popular SocialAuth Java library.The API enables user authentication and sharing updates through different various social networks and hides all the intricacies of generating signatures & token, doing security handshakes and provide an easy mechanism to build cool social apps with minimal coding.

With this library, you can:

Quickly build share functionality for posting updates on facebook, twitter, linkedin and more
Easily create a Share button or a social bar containing various social networks
Access profile of logged in user for easy user registration
Import friend contacts of logged in user (Email, Profile URL and Name)
Do much more using our flexible API like extend it for more network

http://code.google.com/p/socialauth-android/