[kleneway]

For #2, you might want to check out Zuckerbucks, which is a virtual currency for Facebook that paid out real prizes. Careful if you go that route, I know the guy who built it and it can be difficult to constantly be mailing out physical items to people.

[mdolon]

That has been my main concern so far. It's a great incentive but it seems somewhat risky as well. Thanks for your input and the link.