This is a really good point, and highlights a major difference between information derived from users based on them asking for services and explicit data users

This is a really good point, and highlights a major difference between information derived from users based on them asking for services and explicit data users have "declared". The derived information may actually be more valuable, as you say, but because the declared data is more direct and voluntary, it has higher PERCEIVED value (at least it did to me). This may be one of the reasons FB is more attractive then Google right now- and perception is everything when it comes to valuation. Great post, thanks.