For this nugget I focused on MeCommerce (http://mecommerce.goodstorm.com/). How do they get people to sell items on their site? First they attach the user by making it about the user. They share %50 of profits which seems as a fair amount. It is called MEcommerce which also makes it about the user. They emphasize being free and how easy it is to sign up. Also they show an example of a webpage with it set up. Though everything helps, probably the biggest motivator is money. The set allows the user to sell products relevant to their sites and get paid for them. MeCommerce seems to me to be a promising alternative to ads.