I admit the Facebook iPhone app is a little buggy, though I have to hand it to them, they have made a number of UI elements which now seem to be common place on the App Store.
e.g. IIRC they were one of the first apps to have a grid based menu system (ref: Google+ app, Bump, etc) and (I think) also the first app to have sliding menus (where the main view is slid to the right to reveal the menu hidden underneath the main view).
e.g. IIRC they were one of the first apps to have a grid based menu system (ref: Google+ app, Bump, etc) and (I think) also the first app to have sliding menus (where the main view is slid to the right to reveal the menu hidden underneath the main view).