Thanks... I introduced the popup for facebook sign-in and it didn't change my conversion for new (adwords) visitors but like 10% more signed up with facebook so I kept it.

My site posts a timeline post when a user creates a new round (unless you have turned that off). So it is kind of a free impression so I prefer facebook sign-ups. Maybe that is a project for the winter make it mobile (jquery mobile?) and implement some sort of payment system. $10/year seems fair to me. Just have to figure out an amount that will cover my hosting + adwords spend on a typical month.