no voice chat feature, no text chat feature. You are meant to have a sense of community through hints and blood spatters left by other players. Players can invade your world to kill you, or you can summon players to help you.
It's quite the interesting experiment in infusing multiplayer features into a game that still feels completely like a Single Player experience.
edit: not to toot my own horn, but here's a review in which I tried to be informative. http://www.vgchartz.com/games/gamereviewdisp.php?id=31689
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