Unlike some services, which bombard users with the location of everyone in their social network, face2face only notifies users when a contact is nearby, and it does not give out that contact's exact location. This is a subtle difference, but an important one, according to Khan. "We want to look just at what's within walking distance, so oversharing doesn't ruin it," he says.
The application also comes with privacy settings that let users decide if they want to be invisible to others, and who they want to share their information with. Once users know they're near each other, the application lets them communicate, by text, phone, or messages on a social networking site.
Khan says users need a good reason to share their location information, and developers need to assure users that their location will only be shown to people they trust, and that this will be done in a way they can understand and control. Khan adds that social and location information can also make advertising more relevant. For example, in the future, instead of simply offering coupons to nearby coffee shops, his app may offer coupons to a coffee shop where a friend is already sitting.