Like Me Date Me is a new dating site built on top of the Facebook Graph API, which provides search-able access to user profile information. The service displays a photo and limited profile information of whichever gender you want to see. As the name of the site implies, users can "like" others, which can then lead to more interaction. The ratings approach, encouraging snap judgments, is similar to HotOrNot, which also added an option to meet the people you rate.
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.