Originally Posted by Jon in AZ
... By the time you’ve seen your hundredth, you’ll just flag it and move on...
And by the time you have seen a thousand you don't even flag them. Its like putting your finger in a crack in the Hoover dam. Besides, I heard (but cant confirm) that Craigslist ignores flags from any but the area where the ad is listed. And of course it takes multiple flags to delete the ad.