1. A computer implemented method for creating associations between users of a social networking system, the method comprising: receiving images from a user of a social networking system; associating one or more received images with a signature of a camera used to capture the received images, wherein the signature of the camera comprises characteristic information about the camera obtained from images taken from the camera; identifying a first user account associated with the camera based on an action related to the first user account and at least one image captured using the camera; identifying a second user account associated with the camera based on an action related to the second user account and at least one image captured using the camera; and storing an association between the first user account and the second user account.