Hotlinks how to discover origin?

I discovered a lot of hotlinks to my server. I always suspected there were some, but not hundred every day. Now when I try to search for the images hotlinked, I can not find a a lot of sources. I mean, when I search for the URL from my website that contains the hotlinked imaged code, nothing usually shows up.
So what is the meaning of all these hotlinked images, are they or are they not.

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