Variable rewards


Well-known member
You ever wonder what's the crack that makes facebook and mobile games like clash of clans and farmville popular? One of the mechanisms is a concept called Variable Rewards.

There is a great article here: and the article it references:

I just read this article and am trying to figure out a way to apply this system to forums. How can forums apply the concept of a desire engine to help drive greater engagement in a way that doesn't smack of gamification?