The reality is that it’s not just the gaming aspect of apps that captures users. It’s the sociability – and that’s what differentiates the social gaming industry from the traditional industry. The top apps on Facebook right now are Farmville, Texas HoldEm Poker, Birthday Cards, Treasure Isle, Cafe World, and Friend Quiz, respectively. In fact, the top gainers this week have been (according to AppData): Quiz Planet!, Quiz Monster, Friend Quiz, Friend Interview and Status Shuffle, respectively, indicating that social and interest in friends is king.
Many online enterprises are figuring out that the future is social. RealID is Blizzard's hedge against the way that online gaming is developing, not a feature of WoW per se.