I agree that people should be more responsible about what things they choose to post publicly. But networks such as facebook make it really difficult for the average joe (the guy that rock climbs after claiming a back injury) to decipher what is private vs. public. When it's tied to your real-life identity, and potential consequences therein, it should be so simple a toddler could understand.
I feel you. I think 1990's was the time for forums and yahoo chat, where you could be anonymous, and find people like you. But with today's social networks in place, the makeshift internet has lost popularity, even among teens with a tough "real life".
Your piece is spot-on to show how deep today's social platform's tracking systems are. Facebook's array of products know who you are.
Still, there's reddit, with it's 100% anonymity, but with a distinct downside that it's made public, for anyone in the world to access, or for any redditor to check your full history — which can lead to undesired consequences for the online life you've built for yourself.
Either get serious about your privacy on public networks tied to your identity (see facebook privacy checker: https://www.facebook.com/help/443357099140264/ ), only use 100% anonymous public networks (see reddit: https://www.reddit.com/ ) or stick to a 100% private social network, like I've done (see select: https://mailchi.mp/231daaf5ccef/select-03 ).