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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.

Users seem to be struggling in finding games in the new Facebook homepage redesign. While there is a lot of promise in the newly introduced games dashboard, further education cannot overcome the fundamental design flaw of not having “games” as a persistent part of the site navigation, visible from every page.

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.

Counters are coming as a replacement to the much-abused Notifications API – how will developers use them? Zynga gives us a first clue.