Interactions between users on mobile devices can be facilitated by making the users aware when other users have performed similar searches. In one embodiment, when two users executing a mapping application on a mobile device each perform a similar search in a similar geographic area, the server that receives and performs the search request can make each user aware of the other's presence, for example by displaying an icon indicating the other user on the mapping application. The search results may be refined to indicate search results in a geographic area common to the geographic search areas of each user.