As you employ the app, you get notifications of Highlight users within a football field or so of your location. You can check out their profile photos, see if you have mutual friends and common interests, and view a tiny map that shows their recent location. You tap a person's entry for profile details. The closer a person is, and the more interests, friends or history you have in common, the more likely you'll be notified of their presence. But it's possible that you'll be made aware of someone with whom you don't share friends or interests, simply because Highlight finds them interesting.
If someone catches your eye, you can send them a direct message, or choose to "highlight" them. You are notified if someone highlights you and whenever a Facebook friend joins Highlight.
To use Highlight on your iPhone — no Android version yet — you must log into Facebook. (To spread the word, Highlight invites you to invite your Facebook friends.) The company says using Facebook helps ensure people are who they say they are and also lets you see the friends users have in common.
You can make your profile visible to everyone on Highlight or to friends of friends only. Within the app's settings, you can also write a blurb that lets people know why you're there (for example, "I help start-ups"). Most of the people who showed up in my Highlight feed skipped that part.http://www.usatoday.com/tech/columnist/edwardbaig/story/2012-03-20/highlight-app/53673820/1