And if you're not getting traffic from this, then you either do not have a page anyone is interested in visiting or you are blocking the human traffic somehow or blocking the image retrieval hence no thumbnail for anyone to click on and get to your page.
If we're going to get insulting, I might observe that you seem to have an awful lot of trouble wrapping your mind around the idea that websites, like people, are all different. Different designs, different goals.
In my specific, individual case: I have never seen a FB referral other than for e-books. And I don't mean the Paston letters; I mean picture books. The ones where the illustration file outweighs the text by a factor of at least ten. These are all dead-end pages. That is, they physically connect to the rest of the site, but human visitors don't continue. They read the specific book they came for, and then go about their business. It's just fluff.
I am much more intrigued by visitors like the Canadian I found interlaced with yesterday's Facebook referrals.* Originally arrived from points unknown to read up on UCAS legacy fonts, but appears to have spent the whole day sporadically returning to assorted "real" pages. Desktop computer with the identical IP as the initial visit's iPhone, which is not something you see every day. Real pages = ones I wrote myself, containing information that people look for. Not a whole lot of people, but when you're on satellite internet you have to be focused.
Now, if anyone has any idea why the Air Force's 754th Electronic Systems Group is interested-- as in, over 40 humanoid visits to date-- in a page devoted to the animal-filled state of an apartment I no longer live in... They don't seem to have shown up in this Forum, but cursory googling suggests that I am not alone in these sudden inexplicable visits. If it's one of those multiple-tabs, reopen-after-crash situations, I can only say that the Air Force needs to upgrade their hardware. They shouldn't be reloading the page several times a day.
* Which, incidentally, managed to arrive without benefit of clickable pictures, so it's nonsense to say you have to let them pick up either three-- on odd-numbered days-- or all-- on even-numbered days-- image files.