It's enough to identify 87% of the people, apparently: http://www.freedom-to-tinker.com/blog/paul/netflixs-impending-still-avoidable-multi-million-dollar-priva

It's enough to identify 87% of the people, apparently: http://www.freedom-to-tinker.com/blog/paul/netflixs-impending-still-avoidable-multi-million-dollar-privacy-blunder http://www.freedom-to-tinker.com/blog/paul/netflixs-impendin... I hadn't realized that someone identified some of the raters in the previous contest with their imdb ratings: http://www.cs.utexas.edu/~shmat/netflix-faq.html http://www.cs.utexas.edu/~shmat/netflix-faq.html (I hope it's not bad form to reply to myself.) edit: Also, why this matters, page 44 of a research paper (PDF): http://papers.ssrn.com/sol3/papers.cfm?abstract_id=1450006 http://papers.ssrn.com/sol3/papers.cfm?abstract_id=1450006