Knowing that I don't have an answer to your second question, just some ideas of the top of my head. Not optimizing for engagement at all may help. Driving peop

Knowing that I don't have an answer to your second question, just some ideas of the top of my head. Not optimizing for engagement at all may help. Driving people who whish to air their oppinions in public to blogs with RSS as a "follow" button may help. Not concentrating everyone and their mother on the same platform may help. Decentralizing the central features of FB to different providers and technolgies will make it harder to concert these propaganda efforts in my oppinion. Not that they will not try, as has been mentionend before this has happened before the internet existed.