Basically turning every taxi in the city into a traveling photo booth, this app lets you snap a photo of yourself making out with that chick from Harvey's Pub, or whatever else people do in the back of cabs, then attach the medallion number to create a searchable catalog that lets you see exactly who else made out with that chick from Havey's in the exact same cab. Creepy...
New Yorkers seem to be having fun with it.
You can also go online and search for pics that way.
This guy sat in 5F80 in NYC
Looks like the cab driver is in on this one!