Facebook has released a Canvas API for Advertisers that can be used to create compelling canvas ads on Facebook. Advertisers can now create canvas components via API such as header, carousel, button, and text. Advertisers can add Canvas to any Facebook photo, video or carousel ad.
Popular micro-blogging platform Twitter has announced new "retweet" feature that will be added soon, complete with a new retweet API that will allow developers to access retweets in a variety of ways. As many of you know, the Twitter API (our Twitter API Profile) has quickly become one of the most popular APIs in our API Directory.