CL has been taken over by trolls and porno spammers. Since people generally are too lazy to flag those posts they tend to take over (kudzu, Internet-style).
Personally, I have a dark fantasy of finding the owner of the worst CL spammer and introducing them to a hot date with a suicide bomber. But then again, if I said that, I'd have the Feds at my door...
This sucks to see people trashing a board like that. One of the few good alternatives to Ebay left.
Whores use it - they don't have pimps any more.
True of the discussion boards, but I just bought a car from there, and I didn't see a lot of spam on the vehicle listings. And what there was was targeted -- government auctions and such.