Anonymity, data and social networking

A scary report, but not surprising, that explains how so-called anonymised data can be reversed and named again. "New Study Shows Anonymous Data Isn't Very Anonymous At All" (TechDirt, 27 March 2009) linking to the blog of Arvind Narayanan, 33 bits of Entropy, http://33bits.org/2009/03/19/de-anonymizing-social-networks/