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How much is a unique visitor worth on the Internet? Depends on who you are.

Amazon (e-commerce) is generating $189 per user. Google (search) is generating $24 per user. Facebook (social networking) is only generating $4 per user according to this chart from JP Morgan's Imran Khan.

Khan is optimistic Facebook starts bringing in more revenue over time. He sees Facebook as a new platform for the web and thinks it will be able to pick up revenue from applications and games.