Sony has released the PS3 firmware update bringing Facebook to PlayStation Network, reports Joystiq. Rumors had been swirling for a few days that Sony was planning the feature, a move that matched Microsoft s much publicized roll out of Twitter and Facebook for Xbox Live.  Within days of confirming the rumors, and one day after Xbox 360 got its social nets, Sony has released firmware update version 3.1 integrating Facebook into PSN. Read more at Joystiq.