In many European regions the PS4 cam is selling better than XB1 especially because of Just Dance and The Playroom which is quite popular on Twitch and UStream. x}
http://da.twitch.tv/joystiq/b/479695954
http://www.ustream.tv/search?q=THE+PLAYROOM&type=live
I won't buy it unless it gets a killer app like Sports Champions though.