More insidious is that third parties use Facebook APIs which provide tracking info (not just location). I was reading about one which was for sanitary products for ladies, and another of the morning after pill, so Facebook data (wherever/whatever that is) would be able to fairly accurately insinuate when a woman's period is and if she had sex last night.
There were other examples but that was the one which made me think a bit. (Uopu keep hearing in court cases how they know exactly what browsing someone has been doing - but I would imagine that's more likely to come from the ISP, so a VPN would help to obscure just straight browsing - although a cookie can tell quite a bit about you).
Also when the neighbours and family all went up to Birmingham a few weeks back it would have been able to make links between people previously unlinked. It could probably have worked out who was "bride" and who was "groom" -side. It knew which hotels people stayed at, how they got there, where they ate and shopped - and all without anyone posting a single word.
But them Google has quite a bit of that, even without Facebook ( - Google timelines have been mentioned before here).
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