Twitter Takes a Look at Beacons, Invests in Marketing Startup Swirl
http://recode.net/2015/04/23/twitter-takes-a-look-at-beacons-invests-in-marketing-startup-swirl/
http://recode.net/2015/04/23/twitter-takes-a-look-at-beacons-invests-in-marketing-startup-swirl/
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