This Facebook Graph SDK is used to integrate the Facebook Platform with your PHP applications. The Facebook SDK for PHP provides a native interface to the Graph API and Facebook Login. The Graph API enables you with the ability to get data in and out of Facebook's social graph and includes: fetching profile information to provide social context, fetching user information such as their likes or photos, publish posts (including videos or photos) to Facebook and more. Facebook Developers enables you to build, grow and monetize amazing apps.
With Instagram's new App update, the "find your friends" on Twitter is very obviously missing. This is due to restrictions from Twitter's side, and seems to be a snub in Instagram's direction as many apps like Foursquare still have access to this part of the API.
Facebook today unveiled a range of new tools for developers at its F8 developer conference. The Live Video API promises to bring video streaming to more cameras around the world, while the Account SDK shoots for easier app logins, and 'Agents' aims to bring bots to Messenger.