Blizzard announced last year they were developing a social gaming platform called Activate (think cross between Steam & Zynga). My guess is that it's finally ready.
"Some of the features available to developers with the Activate platform are friends lists, leader boards, achievements, invites, and cloud storage to allow players to access their saved games on multiple devices. Players will be able to log in from their Facebook accounts, and an Activate account will be required to utilize the online modes in all supported games."
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