More figures have leaked out concerning Facebook (and wannabe iPhone) social gaming giant Zynga.

According to Dean Takahashi's column at VentureBeat, the company - which is behind such games as Texas Hold’Em Poker, Mafia Wars and Vampires and is hailed as the biggest online US casual games outfit - now boasts 19 million daily users, up from 16 million three weeks ago.

They spend around 14 minutes in each game session. Adding up multiple sessions gives an average daily playtime of 64 minutes.

Zynga's games - the vast majority of which are Facebook published - have been installed 120 million times, and total monthly playtime is 484 million hours. Monthly unique users are estimated at 44 million.

Takahashi also claims the oft-repeated $100 million annual revenue figure for the company is "conservative": indeed he's quoting CEO Mark Pincus on the subject.

Zynga makes its money from micro-transactions via its free games, something Apple is yet to enable on iPhone.

[source: GamesBeat]