1. A computer system comprising: at least one processor; and a memory storing instructions configured to instruct the at least one processor to perform: receiving a comment associated with an image to be tagged by a user of a social networking system; identifying, in response to the received comment, a hint suggestive of at least one aspect relating to the image to be tagged, wherein the hint is based on a reference automatically inserted in the comment as text is being entered for the comment, wherein the reference is a link associated with an object in a social network of the user; determining a set of candidate tags associated with the user; selecting at least one suggested tag from the set of candidate tags based on the hint; and providing the at least one suggested tag for the user to potentially tag the image.