I don't understand the comments suggesting this is "guilty by proxy". These platforms have algorithms designed to keep you engaged and through their callousness, have allowed extremist content to remain visible.
Are we going to ignore all the anti-vaxxer groups who fueled vaccine hesitancy which resulted in long dead diseases making a resurgence?
To call Facebook anything less than complicit in the rise of extremist ideologies and conspiratorial beliefs, is extremely short-sighted.
"But Freedom of Speech!"
If that speech causes harm like convincing a teenager walking into a grocery store and gunning people down is a good idea, you don't deserve to have that speech. Sorry, you've violated the social contract and those people's blood is on your hands.
He died in 1982 but his works are hugely influential:
Philip K Dick.