In one aspect, a method includes verifying a first link in a first resource associated with an entity. The first resource is provided through a social networking service. The first link links to a second resource associated with the entity. The method also includes verifying a second link in the second resource. The second link links to the first resource. Additionally, the method includes receiving acknowledgments of the first resource and receiving acknowledgments of the second resource. The method further includes combining the acknowledgments of the first resource and acknowledgments of the second resource. And the method includes providing the combination for display on the first webpage or the second webpage. Receipt of an acknowledgement from a user who is a member of the social networking website does not add the entity to any access control list associated with the user at the social networking website.