Sounds interesting, will be looking into this some more.
Have a Steam, Origin(Sadly) and Battle.net Account.
Steam: Darksiders 2, All CoDs, Saints Row 3, CSS, DoD:s, Killing Floor, DX:HR, CS:GO, many more.
Origin: Battlefield 3, Syndicate, and Mass Effect 3.
Battle.net: Diablo 2 LoD, StarCraft 2, and Diablo 3.