Thumbs up/Thumbs Down

Greetings - Aside from the obvious, I'm not really sure what these are for - the thumbs up and thumbs down symbols shown when one views a photo in Smugmug. I don't know how many people even use them to indicate like of dislike of a photo, or how the information is used. In any case, it would be nice if, in addition to seeing in my stats how many views there were for each photo, I could also see how many thumbs up and how many thumbs down were indicated for a particular photo.