Zynga has 22m daily users on mobile devices

"Zynga’s chief mobile officer David Ko said that the company has reached 22 million daily active users on mobile. If you consider that Zynga has about 53 million daily active users on Facebook, it’s a pretty strong sign that the company is diversifying on the Facebook platform (although we can’t deduplicate these figures for players who use Zynga games on multiple platforms)."

Source:  Techcrunch, 26th June 2012