Looks like a fun thing to do - especially when gamified. Execution is a bit off though. The reply process is way too complex: if you need my email and a username for no clear reason, make me sign in or let me do it anonymous. Way too many required fields for responding - I can imagine that sometimes you just want to post a word without further explanation or detail.

The design could use some streamlining, too. It looks like some spammy Q&A site now.