Facebook has updated its commenting system (again
, sigh) and among the sillier of "improvements" is an edit feature that lasts approximately ten seconds. Lifehacker details how to edit your comment
: Basically, just hit the delete "X" and it will reopen the text entry box, allowing you the opportunity to polish those precious words of yours. There's tons of caveats, however -- chief among them that it appears to last less than half a minute, and if you refresh the page the editability disappears altogether. Sadly, it looks like there is still no way to un-poke someone. Get on it, Facebook!