Posterous put a lot of energy into detecting & discarding fake emails. I remember this TechCrunch contest, challenging people to forge email headers to get ont

Posterous put a lot of energy into detecting & discarding fake emails. I remember this TechCrunch contest, challenging people to forge email headers to get onto Michael Arrington's Posterous: http://techcrunch.posterous.com/lots-of-fake-post-attempts-onl http://techcrunch.posterous.com/lots-of-fake-post-attempts-o... Seems like this matters a lot less in a review website than in a social network/blog type site, but could still be an issue. I wonder if/how this site dealt with it.