Blue Mars is a free to play massively multiplayer virtual world featuring graphics courtesy of the Cryengine2 platform , realistic characters, and a ton of social activities. Sounds like the Korean social MMO Nurien, except Blue Mars seems to be like a whole world on it’s own like Second Life.
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From the Blue Mars website
The Blue Mars virtual world is made up of an expanding set of independently operated cities that feature unique themes, activities, and attractions such as shopping, avatar customization, unique personal spaces, and games like dancing, racing, and golf. Cites on Blue Mars are tied together with a unified login system, persistent global Avatar ID, and platform wide participation based reward system that encourages users to explore, play, and make new friends.