MySpace is rolling out audio ads embedded into its internet radio service MySpace Music in a bid to boost its advertising revenue, reports Adweek.  MySpace has enlisted internet radio advertiser TargetSpot to run the effort.  Adweek says the social site s need to increase ad revenue became apparent during last week s earnings conference call by parent company News Corp.  During the call, News Corp. head Rubert Murdoch singled out low ad revenues from MySpace for the overall poor performance of the company s digital media group.  Adweek says despite MySpace’s estimated 33 million unique visitors per month, the company’s ad strategy of relying on search placement hasn’t delivered.  Read more at Adweek {link no longer active}.