Why does the Posting History delete itself?

I come back every now and then to posts on threads, but it seems that none of my old posts (my oldest one is in August 2007, all the rests are gone). So these threads must have been deleted. Why? If I ever need to refer to an old thread to remember a question I asked, I won't be able to find it. CNET's other sites don't do this.

Strange... my posting history goes all the way back to when I was level 9. :? But I think that's when I started posting on the GameSpot side, so it could be a temporary glitch.

EDIT: Wait... can you recall when you first posted on GameSpot (not the game-specific boards, which are GameFAQs-regulated)?

^That's probably it; all I post on are individual game boards.I've noticed that a lot of topics are here, and even for inactive boards, they are overcrowded with two-post threads, and about 100 of them.