qz.com
- Zachary M. Seward

It is a strange reality of our times that we have no idea what motivated Dzhokhar Tsarnaev to attack the Boston Marathon, if indeed he was involved, but we do know when he sleeps:
That’s our visualization of tweets by @J_tsar, a Twitter account that has been linked to Dzhokhar, one of the alleged Boston bombers. The darker the pink, the more tweets. What it tells us, quite mundanely, is that Dzhokhar stays up late, often smoking weed, and sleeps past noon. Like so many other college student... show all text
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@kmatthews: Analysis of a digital footprint. Really interesting. // We know when Dzhokhar Tsarnaev sleeps http://t.co/tlhVeO5YhT
@timoreilly: Thoughtful piece on what online data lets us "know" about a terrorist who is otherwise a mystery to us: http://t.co/A04Muiyfov
@Scobleizer: We know when Dzhokhar Tsarnaev sleeps. http://t.co/Pqprfp3fpB
@davewiner: We know when Dzhokhar Tsarnaev sleeps. http://t.co/Pqprfp3fpB