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Bump! app had this, in 2009. Was later acquired by Google.

Ok, because that one seemed real familiar. I was a little confused because I was like "It doesn't already?"

Probably needed UWB. After all, you don't want to be accidentally namedropping in a crowded bus or stadium.

NameDrop is going to wreck the "tap to share" startups.

cc. Popl, Linq, Dot, etc.