Sender! That was the one I couldn't quite bring to mind, thank you. Approved is surely exactly analogous to git's Signed-off-by.

Even crossed out, what on earth have lesbians got to do with any of this?!

http://xkcd.com/624/

Gosh, I'd completely forgotten that one!

eta: and it was only three months ago, at least if the HTTP last-modified date on the image can be trusted. My mind is going, Dave.

If we depended on the quality of posts we would have solved the problem of restricting who can make changes to a newsthread. We never did and so the signal to noice ratio decayed dramatically in the early 1990s. Just one difference I guess.