. >> jonathan haidt is a social psychologist and professor at nyu's stern school of business.n studying social media platforms' drive to keep us glued to our devices, and to their ads, he traces our current troubles to the invention of the "like," "share" and "re-tweet" features a decade ago. >> these changes in the technology that made everything much more viral and explosive, it's as though it gave everybody a dart gun. it's like it gave everybody the ability to complain, attack, criticize anyone at any time in a very short space with no need for evidence, no accountability. >> haidt says the people most likely to fire their social media dart guns are those on the far right and the far left. >> what percentage of the population are they? >> it's about 7% or 8% on each side. >> that's it? >> yeah, that's right. >> so the extremes have been handed the power to dominate even though they are fewer in number? >> that's right, exactly. >> the moderate majority, haidt says, is either exhausted or intimidated. >> it's what i call the structural stupidity. people highly educated, hig