Twitter API

The official Twitter API documentation is part of the Twitter Development Talk Google Group. Join the group, read the docs, and create neat stuff like the apps, hacks, and mashups listed on the Twitter Fan Wiki!

Flash/ActionScript Developers

Want to make a Twitter Flash app like Celly? Here are recently updated versions of the Actionscript libraries for both Actionscript 2 and Actionscript 3.

You might also be interested in the SWX Twitter API for Flash and Flash Lite. This is a third-party service not affiliated with the offical Twitter API.