Look, I semi-agree in the abstract. It is difficult to prove in the individual case. In the aggregate, it's not impossible to prove, if still a bit hard - this

Look, I semi-agree in the abstract. It is difficult to prove in the individual case. In the aggregate, it's not impossible to prove, if still a bit hard - this is what economics/sociology research does, and a lot of governments have statistics/open access/FOIA/etc. So we can know how often these things happen. Specifically to the things you list - again, I don't have statistics here, but based on my gut feeling - most of them barely affect anyone. Do you really think a large amount of people are barred entry into a country because they wrote something on Twitter? I'd imagine this almost never happens, at least today. And btw, I kind of disagree with at least some of your items, like "were you passed for promotion because you're not good enough or because your employer found out through LinkedIn that you were looking for another job last year?". This is not what we were talking about, a case in which "Google" spies on you. This is your employer "spying" on you through your (supposedly public-enough) actions on social media. Changing the place you are looking for a job for from LinkedIn to "NewLinkedIn" won't make any difference for something like this, and is not the fault or responsibility of the company.