Features include name-and-password log-in support, file and directory caching for quick access, firewall and proxy-server support, and UNIX file attribute support.

CNN: Downloads to improve your Web experience

So in settings, you can enter user name and password, and auto configured for Twitter for any Twitter app, no need to log in every time.

FORBES: Apple: Live From The WWDC; OSX Lion, iOS 5; iCloud