This is not really surprising, but it is interesting to see some real data. Anonymised data isn't particularly anonymous. If you think about your activities on a daily basis certain things would be pretty obvious based on your cell location data. It would likely be trivial to pinpoint your house and your place of work. It might also be easy to figure out where you get on and off of the bus, where you park your car, places you like to go for lunch etc.
BBC News - Mobile location data 'present anonymity risk': Recent work has increasingly shown that humans' patterns of movement, however random and unpredictable they seem to be, are actually very limited in scope and can in fact act as a kind of fingerprint for who is doing the moving.
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