When someone posts on a very old thread on a forum, it is called gravedigging.
Gravedigging is frowned upon because the topic of the thread is usually dead - hence the term gravedigging.
Fall0utlover: I absolutely loved Fallout 2 and I can't wait until Black Isle releases Fallout 3.
Loser101: I can't wait for Fallout 3 either, but isn't it being made by Bethesda?
Fall0utlover: Please don't post on old topics and stop gravedigging.