Is MySpace worth $3 billion, or $20 billion? It depends on how you value a user.

It’s time to start comparing the big global social networks on something other than unique visitors and page views. I believe an effective way to value a particular user is based on the average Internet advertising spend per person in the country they live in. The higher the spend, the more value the social network can get out of the user by serving them advertising and other products. That means that, for now, users in a handful of key countries are worth far more in terms of revenue potential than those in the rest of the world.

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