I was just using the gallery overlay, clicked the heart button to like the photo, then noticed it also likes all the comments associated with that photo. Unliking the image using the heart logo unliked all the comments too. I'm not able to individually unlike specific comments either. EDIT: With a bit more playing, I'm not sure if it does actually action the like on the comments on the database. But perhaps only changes the display of the link from 'Like' to 'Unlike' When I clicked 'Unlike' on two of them to reverse the automatic liking, nothing changes on the page. But when I reloaded it, most of the comments reverted back to their their normal unliked position, but the two that I tried to unlike, were actually now liked.