Multiple Online Personality Management (MOPM) services are companies that are part of a rapidly-growing and controversial new mini-industry created to serve anonymous participants in multi-user online communities. These include blogs, "Multi-User Dimensions" (MUDs), newsgroups, "listservs," forum sites, and above all, "wikis," which are considered by many to be the most complex of all in terms of anonymous-persona interaction. While reviled by some as the internet equivalent of "hired goon-squads," MOPM providers are nevertheless recommended by mental health professionals as a means of preventing personality disorders, such as Wikiphrenia and Wikipedepression, that might be caused by continued "Wikiabuse."