To whom have you addressed your first paragraph, Salt and Red Pepper? You use "your" and "you" but I can't see if you mean Rosie or me, or if your are using them generally.
Google owns Facebook, but who or what else does it own? Your explanation suggests to me the whole Internet is under a lot of very shadowy commercial control; and quite what they would gain and how from ordinary users, I don't know.
I try not to give too much away, I keep the more sensitive areas of my life like banking on-line to an absolute minimum, I refuse things like supermarket "loyalty" cards. Nor do I receive many internet advertisements apparently based on my location and interests - and would refuse to respond anyway.
American political sniping as in your (S&RP's) first sentence means nowt to me, and is not my business anyway, as I am a foreigner - though I've noticed that exchanges between American SW users generally, often suggest deep divisions.