NTD News Today (March 1): Twitter’s ‘Zero Tolerance’ Policy for Violent Speech; Station Master Arrested for Greece Train Crash

Twitter is tackling threats of violence with a new “zero tolerance” policy. The new guidelines explain what happens if accounts break the new rules. A Greek train station master has been arrested after a deadly train collision. A passenger train carrying hundreds of people collided with a freight train on Feb. 28, killing dozen...