Seems like we are a bit paranoid, millions / billions of people are using those online platforms and don't think anything about it. And you are absolutely right, facebook is not the worst. It's not even that I mind most of the things these portals use my data for. Heck, it's mainly to personalize ads!
But still, it kind of gives me the creeps to constantly have the feeling someone is breezing down my neck.
Maybe it is also a generation thing. When I was born in the mid seventies, things like computers were very rare, internet simply unheard of. It's like old people not being able to get used to cars, because they only knew horses in their childhood *lol*
I guess I'll have to work on being careful about the new media but not let it freak me out. So as soon as I can figure out how to get an Instagram account and work it from my tablet, I might actually do it