Android :: Writing Mobile Application - Connects Multiple Social Networking Sites

I need to write an Android application that allows a user to connect to multiple social networking sites like MySpace, LinkedIn, FaceBook etc. and fetch friends list.

I know that most of these applications have Java libraries or functionalities exposed as REST based WebServices. But since there is a lot of variety and disparity in the ways that these libaries are written or service that can be consumed, is there any single, integrated service or middleware component that I can use to provide a unified interface in my mobile application?