A simple plugin for extracting information from url entered by user (Something like what facebook does). This gem is built on top of opengraph gem created by michael bleigh.

A full-stack Facebook Graph API wrapper in Ruby (fork of original).

Postman Pat is a Private Mail/Messaging system for users on a webapp. It works in almost the same way as Facebook's private mail system.

Power of Friendship is a friendship library for Rails' Active Records. It allows you to add Facebook style friendships and/or Twitter style followers to any model.

Facebook v2 integration for Rack & Rails application