This is great. I see one immediate problem with group collaboration that sort of makes me not want to use the site -- I have to recruit all my friends and convi

This is great. I see one immediate problem with group collaboration that sort of makes me not want to use the site -- I have to recruit all my friends and convince them to keep adding to the site. Is there some sort of feedback loop to encourage contribution and maintain content so I don't have to do that myself?