we tend to only communicate with people that we agree with, and thanks to social media, we can mute, un-follow and block everybody else/  
social media experiences are designed in a way that favours broadcasting over engagements, posts over discussions, shallow comments over deep conversations
Facebook revolutions but when the smoke is cleared, most of these revolutions failed to build any sustainable new political order, in part because as so many voices got amplified, consensus-  building became impossible