Eventually, even though you think the so called social media of these days are free of cost, in reality, you are paying a price more valuable than some bucks.
Dependence. Personal information. Time.
By ordering your feed in random basis(based on what you liked and what you did not in past) they keep you attached as long as possible in order to serve you as many ads as possible.
Monetizing your time and your information and yourself.
Withdraw yourself from those social media before it is already time to regret.