In one implementation, a method includes receiving a claim that identifies a first user profile page as allegedly impersonating a second user profile page on a social network, and retrieving first information associated with the first user profile page and second information associated with the second user profile page. The method can also include comparing the first information and the second information to identify indicators of impersonation. The method can further include, based upon the identified indicators of impersonation, determining that the first user profile page is likely impersonating the second user profile page on the social network, wherein first user profile page is determined to be likely impersonating the second user profile page when the first and second user profile pages are determined to be similar to each other; and returning a flag indicating that the first user profile page is likely impersonating the second user profile page.