After noticing a lot of old questions getting dragged back to the front page I looked into why - They've all been edited to fix broken links pointing to a single domain. I then got curious about the person doing the editing (they must have been approved by someone else because the user has only 33 rep).
One rather remarkable thing stood out on that user's profile page. Namely, that he has been getting 2 rep for posts where his only input was an edit. When did rep start being handed out for edits?