Rovio’s North American general manager Andrew Stalbow has indicated at the Web 2.0 conference that Angry Birds now has over 30 million daily average users (DAU). This would make the game the most popular on Facebook… if it was on Facebook.

Currently, the most popular game on Facebook is CityVille, which is registered as having a DAU of 12.1 million with Sims Social next with 8.8 million. Those numbers dropped quite a bit when the way DAU was recalculated to exclude users who navigate away from apps’ landing pages without logging in.

Also, Stalbow estimates that Angry Birds sees an estimated 300 million minutes of play every day, having been downloaded 400 million times. The fastest growing market, and second largest overall, is China.