Thanks for the reply. I've noticed there are three aspects in building a successful content/aggregation sites. 1. Provide value to businesses by giving exposu

Thanks for the reply. I've noticed there are three aspects in building a successful content/aggregation sites. 1. Provide value to businesses by giving exposure to their products. This is the best way to make money from the service. The aspect I like about these sites is you don't need to rely on traditional advertising. 2. Provide a motivation for users to contribute content (mainly ego and recognition). This is hard because you need lots of users for this to work. Good examples are lookbook.nu, wikipedia etc. 3. Provide a good one player experience - even if you don't have an account, it's still worth visiting. I visit sites like fffffound, designspiration, or dribbble every day - even though I don't have an account or know anyone else using the site.