From the Creepy Shit files (via New York Times):

Twitter knows when you nap. At least its engineers think they have a pretty good idea when you nap, because those are the few times when you’re not pouring your heart out in 140-character bursts.

Peering into its fire hose of tweets from four big cities around the world, a pair of Twitter engineers, Manuel Rios and Jimmy Lin, have discovered that the Twitter users in Istanbul don’t sleep much in August — and why would they, considering how many people are strolling along Istiklal Avenue on summer evenings. The denizens of Sao Paulo, Brazil, seem to take an afternoon siesta – tweets sharply drop off in the period after lunch.

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