The foursquare-api-client is a library that allows users to interact with the Foursquare API using Guzzle, a PHP HTTP client. Guzzle has been fully unit tested so that the library serves as a wrapper around the Guzzle core.
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.