I can't help but notice a market opportunity evolving out of the need to moderate comments. I imagine a service where sites could hire cheap, proven moderators - and pay based on the number of comments needing review.

Two-sided marketplaces are undeniably extremely hard to build, but seeing as this is a huge problem and something tons of websites need, maybe it could be successful in this case.

Anyone know of anything out there like this/think this could work? I guess there's MTurk.