Comment: Crowdsourcing will not help (Score 4, Insightful) 55
It seems to me that you could do a p2p certificate authority where a certificates trust is based on the number of people who trust the cert as well as a past history of your trusts.
As someone else pointed out, that's Moxie's other project, Convergence. The trouble with "web of trust" schemes like that is fake "people", i.e. dummy accounts. Dummy account generators have trashed Craigslist, turned Hotmail into a reply service for spammers, garbaged Gmail, filled Google+ with fake accounts, and created vast numbers of bogus Yelp reviews. See my paper "Social is bad for search, and search is bad for social." for the details of who does that dirty work.
The trouble with crowdsourcing is that crowds can be outsourced.