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Craigslist is receiving spam which can foil normal methods to prevent automated submissions (CAPTCHA and IP restrictions).

I suspect that eventually sophisticated submission software will be targetted at small sites which don't have sophisticated preventative methods, such as paler.com.  To prevent submission, new ways of restricting comments will be needed.  Users won't want to give our credit card details to all and sundry (and not everyone has credit cards).  For now, sites such as this rely on requiring users to register before posting.  During the recent software upgrade, anonymous posting was turned on accidentally - resulting in 1600 spam submissions which have now been deleted (unfortunately some real posts from non-automated anonymous posters have also have been lost ).