[seiji]

certainly doesn't sell personal data.

It just sells access to use the data, not to know what the data is.

Their proposition is: "Give us $50 and you can target 26 year old iPhone users who go to Stanford and have posted about bratwurst in the past six hours."

You're paying to use the data they've collected about their users.

If they didn't sell access to use personal data, we'd be back to flat banner ads with no retargeting or privacy invading doubleclick social strata pinning.