One sentence from the Senate's social media hearing should petrify Google, Facebook and Twitter

On Tuesday lawyers for Google, Facebook and Twitter were in Washington answering questions about the 2016 election but left Senators largely unsatisfied. Senators were left thinking the companies don't have the ability to fully know what's going on on their platforms as they operate now. Washington may seek to change that. We've done this before in America — back in the 1930s when radio was the new menace carrying misinformation and propaganda. For social networks to properly police users...