facebook-actionscript-api is an Actionscript SDK that helps developers create apps that integrate the Facebook platform with Flash. It can be used to add social elements to Flash games, let users access apps via Facebook Connect, and more. This SDK is fully supported by both Adobe and Facebook.
Twitter has announced that the company is unifying its API platform so that it’s hopefully easier for developer to build scalable Twitter-powered applications and is opening access to several new Direct Message APIs. A new beta Account Activity API and several new endpoints are available today.