Start identifying personas in your ideal scenarios. I can currently see these options:  
  
\- **Writer** (lot of stories)  
\- **Curious** (lot of questions)  
\- **Doer** (lot of projects)  
\- **Critic** (lot of comments)  
\- **Supporter** (lot of zaps)  
\- **Solver** (lot of answers - need to find a way to vote/zap comments too, so the most zapped = the most useful)  
  
just ideas