Who saw this one coming? No one, that's who. Wooga announced on its company blog that it is officially the fourth most popular social game studio in the world, according to AppData. At 20.4 million monthly players, the Berlin-based developer is now more popular than both Playdom and PopCap of Social City and Bejeweled Blitz fame, respectively. And Wooga, who recently released a social puzzler called Diamond Dash, isn't stopping anytime soon.