It could very well turn out to be News Corp.'s 2005 purchase of MySpace for $580 million (sorry Viacom). Pali Research analyst Richard Greenfield figures that the Bev Hills-based social networking site is generating in excess of $30 million a month in revenue, and that should double over the next 12 months with little increase in operating expenses. Annual revenues: over $700 million a year - not including the $900 million that Google pays out to News Corp. for exclusive search rights. Just a year ago, monthly ad revenues were running $13 million.