A facebook employee explained me how tracking works. Its not the email address Meta is concerned about. Its the IP, device identifiers and location. Meta doesnt care about the email at all apart from sending you emails for notification. Even with a fake email they exactly know who you are. Let’s say you visit CNN.com which has facebook tracker. Facebook has the IP and the device identifiers. Now you login with fake email account on Instagram, facebook knows that’s the IP ans the same device hence it “must” be the same person That’s how facebook creates shadow profiles.
Preaching to the choir but food to remind some people. Thats why you avoid or limit use of those services. Use tor or a VPN and use multiple layers of blocking such as DNS and in browser blocking. Also foss only applications where possible.
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Proton VPN is free and there is also riseup VPN. I run a tor node so I can at least vouch for that one 🙂. The more people that use it and run nodes the more it normalizes it. You can also use onion repos in your distro if supported. I know Debian had had then for a few years now and it uses the apt-transport-tor package.
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A tor node or relay is just someone running and configuring tor on their server to accept and forward connections to the tor network being part of the chain. Normally a chain has three nodes: an entry , a middle and an exit.
Onion repos are software repositories in this case for the Debian Linux operating system that contain firmware and package updates and are hosted as onion services accessible over tor.