Probably a http request tracking ID that can be used for debugging the request. | Hacker News

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		Oppertunity123 on Dec 30, 2019 \| parent \| context \| favorite \| on: Fake “like” factories – how we reverse engineered ... Probably a http request tracking ID that can be used for debugging the request.

ceejayoz on Dec 31, 2019 [–]

It's a "Facebook click ID" and it's likely intended to evade Safari's "Intelligent Tracking Prevention" on third-party cookies.

jtbayly on Dec 31, 2019 | [–]

This. We knew this was coming when Safari added that.

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