Social media platforms face a reckoning over hate speech

For years, social media platforms have fueled political polarization and hosted an explosion of hate speech.What's not yet clear is whether this action is too little, too late — nor whether the pressure on these companies, including a growing advertiser boycott, will be enough to produce lasting change.Reddit, an online comment forum that is one of the world's most popular websites, on Monday banned a forum that supported President-Donald Trump as part of a crackdown on hate speech.