But where do Bostonians go (besides Dunkin' Donuts, that is) for their beloved java? Thanks to data from check-in app Swarm, we were able to find out which coffee shops people checked into the most from Wednesday, March 23 to Tuesday, March 29. For those unfamiliar, Swarm is an app from Foursquare that lets users check in when they visit locations like restaurants, bars, and parks.