The Tweetinvi C#/.NET library provides access to the Twitter REST and Streaming APIs. This unofficial library offers 3 different classes for Messages, Twitter Users, and Tweets. Tweetinvi also offers Streaminvi, for access to the Twitter Streaming API. The Streaminvi library has two classes, SimpleStream for all the data provided by Twitter, and FilteredStream for extracting specific data from Twitter. The Tweetinvi library is offered under a Microsoft Public License (Ms-PL).
The red hot startup of late, Pinterest, certainly has a friend in Facebook. Users of the pinning site can sign in with an account from the dominant social network. In a new post, Facebook suggests it's Pinterest's inclusion in Facebook Timeline that is driving its growth.