Fast typists beware of hitting return when replying to a post on a Facebook wall! As yesterday, March 15 (the Ides of March), Facebook rolled a new wall post procedure. Gone is the button to post, in it's place a press of the return button now posts your comment or reply.
How do you get around this user interface (UI) change? Simply retrain yourself to use shift & return keys if you desire a hard return in your commenting or reply. Or, learn to self-govern your commenting and replies, or you may need to delete and repost a number of times before you get the hang of it.
Don't let this change to the UI be the death of your Facebook wall interactions!