Ask HN: A startup centered around gamification

A lot of sites use gamification techniques to encourage activities that they want to see on the site, such as Stack Exchange, Khan Academy, and even game platforms such as Xbox and PlayStation.

My question is, would it be possible to take advantage of this trend by gamifying things that users are already doing? For example, gamify your actions on Twitter and Facebook? What would be a good way to do this and what problem would this solve?