A lot of my facebook time happens on my iPad or iPhone. After reading lots of posts, the process of scrolling back to the top can be annoying.
Here’s a simple trick to zip back to the top of the page: Tap on the time at the top of the screen. You’ll be taken back to the beginning of the page quicker than facebook can change their layout again!
This works in all the apps I’ve tried on my iPad/iPhone running IOS 5: Safari, Pages, facebook, Numbers and Mail. I suspect it works for any app where the content extends farther than the screen can display. Let me know if you find an app where it doesn’t work.