Mobocracy is a synonym for ochlocracy, the rule by a group of people unrestrained by any meaningful principles. A mobocracy has a tendency to be arbitrary and to engage in bullying towards critics or dissenters. Wikis and other online communities tend towards mobocracy if strong measures aren't taken to prevent this. Many conservatives feel that Wikipedia takes inadequate measures. 
- Chris Edwards. On Wikipedia, nobody's sure you're a prof, HackingCaugh, 1 March 2007.