The RubyRedditAPI is a Ruby wrapper for the Reddit API. It is authored by James Cook and documentation can be found on GitHub. Some of the features for this Ruby wrapper are: authentication, searching, friend and un-friending redditors, comment and submission voting, and more.
After four months, Facebook is set to open its timeline actions to developers this week, according to AllThingsD. The feature is an addition to the Facebook Graph API that allows developers to assign verbs for actions users perform within applications. For example, how users now "like" things, they'll also be able to "read" articles, "play" games and "listen" to music. I would expect many, many actions to be submitted to Facebook for approval, especially related to game-specific acts. It's too early to tell how closely the social network will watch its pending list of actions, though there's a clear approval process.