On this tab, you can see a list of all users whose friendship you rejected. Once in the rejected status, the user can't request your friendship anymore. You can either Approve (
) some user's friendship, which makes her your friend, or Remove (
) the user from the list of rejected, which enables her to request your friendship again. By checking some of the check-boxes and clicking one of the Approve all selected friends or Remove all selected friends, you can approve or remove more users at once.