>> Thanks, never seen that before.
It's part of how you are identified and tracked. The combination of features they can track/detect allow them to either uniquely or close to uniquely identify you.
Detecting your operating system, browser version, installed plug-ins & versions. screen resolution, fonts, time zone, etc. etc. etc. gives them a unique combination identifying you.
So you may log not one site as Joe, into anther site as Bloggs, into a 3rd as Anon and anonymously via a vpn on a fourth, and they can detect that they are all from the same computer.
So if they buy loads of records from loads of different sites, they can build up a fairly scary record of everything you do, without you actually telling them anything.
Don't forget, even a VPN only stops your ISP tracking you (and potentially sharing that with the State), the website you're going to still knows all it wishes to know about you.
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