Why and how does EBay share searches with Facebook?

Why and how does EBay share searches with Facebook?

I am using the Epic Privacy Browser which blocks trackers and deletes history and cookie type information at exit.
Yesterday, I looked on EBay (not logged in to EBay) to check prices on a used camera. I am pretty sure I was not logged into Facebook either. I may have to experiment to see what they are doing.
Today, I log into Facebook and Facebook shows me an ad – “Inspired? Take another look!” with a link to the used camera I was looking at.
This is disturbing to find myself stalked online by EBay and Facebook, even when I am taking steps to avoid being stalked. This is not right.

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