After a month of Barack Obama’s town hall meeting, Dick Costolo stepped down as CEO. NEW YORK: Former Twitter CEO Dick Costolo had secretly ordered employees to filter out abusive and hateful replies to US President Barack Obama during the May 2015 #AskPOTUS town hall meeting, the media reported on Friday. According to a report, Costolo asked employees to deploy an algorithm which was built in-house to filter out abusive language directed at...