The Instagram API implementation in PHP enables developers to access the Instagram API's methods from their PHP code. This library comes with example files and sample code to help developers get started.
Facebook has announced the release of the Facebook SDK 3.0 Beta for Android and the launch of the new Android Developer Center. This latest release of the SDK for Android is what Facebook is calling the "biggest overhaul of our Android SDK so far."
Have you noticed the many tools to share your location? There's FourSquare and Gowalla, both about a year old. Then there are old-timers like Brightkite. And now, there's one that works with all three (and a couple more).