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You could use NFC to exchange data. You could, for example, perform a hip bump to add somebody to your Tweetface circle; or grind on somebody to trade phone numbers; or leave a tip by rubbing somebody's pants pocket... all without directly manipulating phones!

(I imagine this'd be increasingly relevant as the screens on these things get bigger and bigger and it becomes difficult even to remove your phone from your pocket.)

Most (all?) NFC implementations require the screen to be on to perform NFC actions. Of course you could just slip your hand into someone's pocket and turn on the screen...

That's because the screen is the primary UI. But imagine authorizing NFC transactions using audio instead, or something as [currently] outlandish as a neural interface. Perhaps you could pre-emptively allow your phone to collect contact information before hitting the club.

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