do they though? I consume Coca Cola, and so do approx 2B other earthing. Does Coca Cola have influence over me?
When you interact with coke does it gently tailor what you see and what you do not see, month after month?
If you cannot understand how people are influenced, maybe you'll never see the influencing happening. That doesn't make you immune, on the contrary...
Facebook can, has, and certainly will continue to monitor and influence MOST aspects of peoples lives - social, political, religious, economic, etc. Just ads and subtle filtering of walls and ads alone is provably HUGE impact-wise.