Twitter Inc. suspended the account of Martin Shkreli after the brash former pharmaceutical executive harassed a female reporter online, the latest high-profile case of abuse on the social media service. Over the past few days, freelance reporter Lauren Duca posted about several unwanted digital advances by Shkreli, the former chief executive officer of Turing Pharmaceuticals AG, including a message in which Shkreli invited her to the inauguration of President-elect Donald Trump.