It all adds to the value of their dataset for targeting ads. Being able to put a demographic profile to an IP address has to be worth a lot to Facebook. I don't think many people who understand now the web works will be surprised by this, they still know you visit a page with a facebook item on it wither via cookie or IP. I think this may come as a surprise to a lot of regular FB users though.
Mack.
tangor
5:31 am on Apr 10, 2019 (gmt 0)
Hence use of NoScript (example), which kills scripts, js, etc as needed ... and can deny FB (or other trackers).
Creepy behavior requires diligence. Sigh.
brotherhood of LAN
6:52 am on Apr 12, 2019 (gmt 0)
Totally unsurprising. It would also be unsurprising if their processes for retrieving or deleting accounts on requests is terrible