In one embodiment, a method includes determining a first geographic location of a client computer of a first user, receiving one or more first meet-up preferences from the first user, and identifying a second user based on one or more notification rules and the first meet-up preferences. The second user may be associated with one or more second meet-up preferences. After sending a first notification to the client computer of the first user and a second notification to the client computer of the second user based on the first meet-up preferences and the second meet-up preferences, the method further includes receiving a first opt-in response from the first user, receiving a second opt-in response from the second user, and sending a first meet-up confirmation to the first user and a second meet-up confirmation to the second user.