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Here's the article where I heard about the gay facebook page thing:
http://www.boston.com/bostonglobe/ideas/articles/2009/09/20/project_gaydar_an_mit_experiment_raises_new_questions_about_online_privacy/?page=full
Here's where I read about calculating SSN's:
http://arstechnica.com/tech-policy/news/2009/07/social-insecurity-numbers-open-to-hacking.ars
This thread is for the discussion of Less Wrong topics that have not appeared in recent posts. If a discussion gets unwieldy, celebrate by turning it into a top-level post.