System and method of alerting users based on proximity

A method comprising:

• receiving an identification of a first location associated with a current location of a first user;
• receiving an identification of a second location associated with a current location of a second user, the second user being different from the first user;
• determining, with a processor, whether the first user is at a location unusual for the first user based on a location history for the first user, the location history identifying a plurality of geographic locations previously visited by the first user;
• determining, with a processor, whether the first location is proximate to the second location by comparing the distance between the first location and the second location to a first threshold;
• and
• providing an alert to the second user based on whether the first user is at a location unusual for the first user and whether the first location is proximate to the second location.