Apple has just announced a new feature of iOS 5 – Twitter integration.

With this feature, users can take advantage of “single sign-in,” and can tweet about Web articles (in Safari) and videos (in the YouTune app). Furthermore, the feature “grabs” contact photos from Twitter.com.

As outlined by Scott Forstall:

We added twitter to many of our apps. Like Cameras, photos. There is a new option to share: Tweet and it opens a nice sheet. You can get a countdown and even optionally add your location. It’s that simple.

We’ll be updating this post with more information soon, so keep checking back!