Back button for Messenger
Reported by Peggy Ottman
Peggy Ottman: No back button to return to newsfeed from messenger
Peggy Ottman: Never mind! I just tried swiping again and voila!
This is the last issue holding up the 4.1.0 release. So if we can get this fixed quickly, we should be good for a build.
FYI: @markeharding