EVCin

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.

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.

The top games on Facebok are down 11% from their highs this month. While it looks like it might be due to the holidays, the successive declines in the peaks of the latest Zynga releases might suggest the life cycle for social games is changing.

Efforts to revitalize a creaking Mafia Wars infrastructure not built to sustain 6 million users a day back-fired with unexpected errors and outages. What does it say about other Zynga hits and their ability to sustain more traffic than they may have been built for?

Quick Notes about Playfish testing out offering Offers as an option to earn coins, Looking at Happy Hour’s cross-promotion of Enchanted Island through Notifications, Cafe World’s vault to the #2 spot, and FarmVille leveraging users’ request for country flags to drive visitors and most likely sales.