The Sims Social comes closer to CityVille going into the month of October on our list of top 25 Facebook games by size. Last month, the game debuted at No.3 in daily active users and No.5 by monthly active users.

There are some newcomers to our rankings this month, but only one of them is a newly-launched game. Zynga’s Adventure World went live in early September while Social Point’s Social Empires and DoubleDown Casino have been around for 10 months or more before finally hitting their all-time traffic highs in the last month. In the case of Social Point, it seems as though the game is benefiting from investor funding closed in July. As for not-quite-newcomers, EA PopCap’s Zuma Blitz returns to the rankings after a brief absence.

A notable absence from our list this month is Gaia Online’s Monster Galaxy. After a long period of sustained growth, the game has declined dramatically in the past two months or so, falling more than 83% across both MAU and DAU in that time period.

These figures are based on October 7, 2011 totals logged in AppData.