Similarly, The Sims Social rocketed to over 65 million monthly players just after its launch in 2011, only to drop to just over five million monthly players today, according to AppData. SimCity Social seems to have peaked at 10 million monthly players and has managed to hold on to just over one million of them less than a year after its launch.
via As player numbers crater, EA will shut SimCity Social, other Facebook games | Ars Technica.