Zynga has proven their ability to cross-promote new games to their existing userbase again and again, most recently with FrontierVille and CityVille (although t

Zynga has proven their ability to cross-promote new games to their existing userbase again and again, most recently with FrontierVille and CityVille (although these games were - and still are - also bolstered by extensive advertising through Facebook ads, CPI campaigns, etc). They currently run 3 of the top 5 apps by MAU - CityVille, FrontierVille, & Texas HoldEm Poker, at about 90MM, 46MM, and 35MM MAU respectively. Even their "customer loyalty" Facebook Connect site (RewardVille) is a top-25 FB app (about 25MM MAU). In my own experience, it's also the only FB games company that most laypeople (people who neither work in tech/social games nor play Facebook games) recognize. It's hard to say whether they'll ever achieve the stature or reputation of a Blizzard, but I can't even think of many traditional game companies that enjoy the same type and intensity of customer loyalty that Blizzard does. Maybe Valve? Very few people buy every EA title but the Madden franchise has incredible loyalty... where does something like that fit into a comparison like this?