Now the challenge will be to make money from all of those users. If Zynga hangs on to them, it stands a chance of becoming a far bigger player in social games than it already is.
When CityVille took off shortly after its launch on Dec. 2, it was clear that its growth path was going to break all records. We knew this would happen, but it’s still pretty astounding. It’s going to be a pretty Merry Christmas for Zynga. Zynga’s traffic on Facebook has now soared to 261.6 million monthly active users, which is probably near its all-time peak. In November, Zynga had around 198 million monthly active users."
Source: VentureBeat, 24th December 2010