[GregT] Arkem wrote an academic paper on Twitter as a vector for disinformation, a copy of which can be found here: ( http://arkem.org/disinfo-twitter.pdf )

Basically saying that Twitter is better at spreading rumour than fact because information flow is assymetric. If you Tweet to 100 followers, and 99 reject it as bad information, but 1 retweets it, the 99 have no direct way of knowing about or correcting the 1 or the 1's followers.