What is fbclid? the new facebook parameter Languages

What is fbclid? the new facebook parameter

I have noticed that for two days to the url that I publish in facebook, the parameter is added: ?fbclid=uFCrBkUgEvKg... To be more precise something like: http://example.com?fbclid=uFCrBkUgEvKg... Does anyone know what this parameter does, what is it for and what is the use of the developers?
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