Users with "Can Contribute" permissions have the ability to like and comment on photos that have been sent to a Site Timeline widget. In order to like a photo a user need sonly clickt he heart icon below each emdia resource or comment. When a user likes a photo the number beside the increases by one and turns red for that logged in user indicating they have liked that resource or comment. For each media resource users can also leave comments. this is a gret opportunity for peer review or just to engage users with your site.