Stephen Murdoch, PhD doctorate at the University of Cambridge Computer Laboratory on the principal weakness of 'covert channels', that means anonymizing systems like TOR. Watching the patterns of behaviour of different users reveals their intentions, if not their identity. A nice reminder that usage of anonymity tools alone is no guarantee for surfing incognito at all. (Source)

What now? Dispersion of behaviour, adding a random element in your online practice, usage of multiple anonymity tools. A high price to escape the eye of Mordor.