Facebook (FB) pushed out another big update to its iOS app on Monday that combines the best elements of its standalone Camera app and Messenger app. Beating Twitter to the punch, the Facebook iOS app now lets users muck around with 13 filters before uploading photos and also lets them batch upload multiple photos at once. Other new additions to the app include a chat pane that can be activated by sliding a finger from the right side of the screen to the left, Facebook Gifts (U.S. only) and the ability to see if your friends are available on chat in real-time. Users can also add friends they talk to frequently to the top of their Favorites section. Facebook 5.1 for iPhone, iPod touch and iPad can be downloaded here or through the App Store.