The Facebook SDK for Android is the easiest way to integrate your Android app with Facebook's platform. The SDK provides support for Login with Facebook authentication, reading and writing to Facebook APIs and support for UI elements such as pickers and dialogs.

The Google Data Protocol is a REST-inspired technology for reading, writing, and modifying information on the web. Many services at Google provide external access to data and functionality through APIs that utilize the Google Data Protocol. The protocol currently supports two primary modes of access: AtomPub: Information is sent as a collection of Atom items, using the standard Atom syndication format to represent data and HTTP to handle communication. The Google Data Protocol extends AtomPub for processing queries, authentication, and batch requests. JSON: Information is sent as JSON objects that mirror the Atom representation.

What is Signpost? Signpost is the easy and intuitive solution for signing HTTP messages on the Java platform in conformance with the OAuth Core 1.0a standard. Signpost follows a modular and flexible design, allowing you to combine it with different HTTP messaging layers. Click here for a list of supported HTTP libraries. Signpost is a community effort and may be downloaded, modified, and redistributed under the terms of the Apache License version 2.