The biggest is problem is the governance that the networks have over your data. Taking it and then doing whatever the like with it. Projects like Sylo (check my post history) have a goal and an already working product to help take back our dependence on the main networks.
Then what should we do? Hide our data? As far as i know the countries that have been doing this were only china,russia,North korea and USA,
Most of the third world countries has no interest in doing such so. You were right and it is not facebook that you should be afraid of but instead watch and be careful in giving your data to google