What are these tiny dots for?

rado84

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I noticed these weird tiny dots on the forum interface in 3 places on the index page. I thought they were artifacts but it turned out they weren't - they're weird iframes sized 4x4 px which makes me wonder what is it that is supposed to fit into that tiny area.
I do have an adblocker but NOTHING is being blocked on linux.org, so the presence of these tiny dots becomes and remains a mystery.

EKXzSm3.png



FF inspection tool:

ucIubMY.png
 


It's a facebook tracking dot in disguise. I don't see it when I view the forum index. Maybe @Rob knows?
 
Those look like places where an ad could be placed. Otherwise, I'm stumped.
 

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