A recent Schneier blog points to this research http://papers.ssrn.com/sol3/papers.cfm?abstract_id=2700347
Summarizing, it seems possible to match anonymized users (at least in a marketing profile sense) to registered users or past purchasers, by analyzing how they interact with a site. I wonder how applicable this is to non-marketing contexts. Assuming the above is at all effective in narrowing down the anonymity set further, it underscores the need to either change behaviour randomly or behave like everyone else using TBB or Tails.
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