It's when you push the radar button that Girls Around Me does what it says on the tin. I pressed the button for my friends. Immediately, Girls Around Me went into radar mode, and after just a few seconds, the map around us was filled with pictures of girls who were in the neighborhood. Since I was showing off the app on a Saturday night, there were dozens of girls out on the town in our local area.
"Wait... what? Are these girls prostitutes?" one of my friends asked, which given the Matrix-like silhouettes posing on the splash screen was a pretty good question.
"Oh, no," I replied. "These are just regular girls. See this girl? Her name's Zoe. She lives on the same street as me and Brittany. She works at a coffee shop, and I'm pretty sure she doesn't moonlight picking up tricks."
Update: Charlie Stross has a good followup to this.