I post other people's answers that I've read, but it's always with attribution or at least with "copied from x". I imagine if someone did the same with your post but didn't provide attribution it was out of pure laziness. When I post on /g/, an anonymous message board, I often copy paste other answers or code without attribution since it's easier and people don't usually care where it came from, and no one will care whether I wrote it or not. I imagine I'm not alone in this.
