1. A method comprising: one or more processors to implement the steps: comparing at least one reference image of a new member of a social network system to each one of a group of stored images in the social network system, wherein the stored images were uploaded to the social network system prior to the new member joining the social network system and the stored images have not been tagged with a tag corresponding to the new member; computing a metric corresponding to each stored image based on comparing the at least one reference image of a new member of a social network system to each stored image, the metric representing a probability that the new member is pictured in the corresponding stored image; generating a list of images of the new member, wherein the generating includes identifying each stored image determined to contain an image of the new member based on a corresponding metric, each image in the list of images of the new member having a probability, above a threshold, of containing an image of the new member; repetitively performing the comparing and the generating according to a schedule; and enabling the new member to apply to each image in the list of images a tag corresponding to the new member and send a notification to another member associated with an image.