Face Book as marketing tool?

USA Today has an article today about a Face Book plan to use the data voluntarily provided by Face Book users to display targeted ads .

Blogs and social networks sites provide ample opportunities to disclose, voluntarily, a cornucopia of personal information. Why disclosing voluntarily so much personal information? New York Magazine published last February an interesting article on the subject , written by Emily Nussbaum. In the academic world, Danah Boyd wrote Why Youth (Heart) Social Network Sites: The Roles of Networked Publics in Teenage Social Life.