Its obvious that there's a ton of money in selling people's information for advertising, but I don't think that people are even that angry that their information is being sold so much as they aren't aware of what information is being sold. I think that it'd be interesting to see more transparency in selling of information so that target advertising can still be easily done which allowing the users to actively choose one product over another if they don't want their email addresses being given out as compared to cookies for search relevancy or something along those lines.