Oh, come on. Anyone who worked with FB ads system as "client" understands the power and price of the data that they collect. This is not conspiracy theory but fact. And I can't imagine the amount of data that browser owner able to collect. I'd guess that even MS knows less about me than Google despite of the fact that I use Windows.
do you really think your "data" is valuable? or was this just an idea put in your head by journalists?
ponder that for a moment