A Like button is added to all lightboxes. Observe that a Like count is also displayed below the Like button. From rtMedia v3.9 onward, media authors will be notified if other members Like the media.
From rtMedia v4.3, Media Likes can be disabled from the backend Settings under
Settings > Display > Enable likes for media
Note: If you are the end-user and do not see the Like button feature available, you will need to contact website Admin.