Joystiq reports on a Sony session at last week’s Game Developers Conference highlighting recent growth spurts for PlayStation Home, the free avatar-populated social and gaming space on PlayStation Network. During the session Sony PlayStation Home director Jack Buser said the service now has twelve million users, doubling its user base since June 2009 and adding two million users since just December. He added that 85 percent of those who sign up and create avatars return more than once to the service. Buser called Home an incredibly important part of Sony’s strategy” and cited internal efforts with creating content for it. Joystiq says Buser’s talk was directed to developers considering making games and other content specifically for Home. Read more at Joystiq.