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Survey by Zynga tips off their intention to enter the city building sim genre and take on Playdom’s scorching hot Social City.

Facebook depricated Notificaitons for applications on March 1st – Clearly it’s not the doomsday scenario that some feared as developers are mostly relying on email or fan page posts to replace application-to-user notifications, while user-to-user notifications are being facilitated through creative use of Wall Posts.

Successful viral marketing promos in FarmVille have been quickly passed along to two other Zynga hits: Cafe World and Mafia Wars. Whether they will see similar traffic boosts remains to be seen.

FarmVille bucks the no-growth trend, passing 30 million by twisting the “gifting” mechanism from sending gifts to asking for gifts.

Zynga innovates with a progress bar to get users to sign up for mutliple communication devices. Playfish’s Gangster City doesn’t look like it’s sticky enough as DAUs flatten out. And Zynga Poker touts 6 million daily users – but they still haven’t reached that number yet on Facebook.