Recently there was a case in the Russian livejournal community when someone set up a hoax account of a prominent person and used it to produce loads of silly comments in highly visible journals.
That made me wonder how to make sure that a hoax author can be easily identified. I didn't come to a complete solution of the problem, but it occurred to me that livejournal is a good implementation of a trusted peer network, and seems to be a good place to sign, exchange and use public keys. What do you think about this idea (as if you had nothing else to think about)?