Journalists on Twitter are faced with an impossible task, a choice between building their following or avoiding harassment. More often than not, they face those risks without the support of their editors and newsrooms.On this week’s Kicker, Jacob L. Nelson, an assistant professor at the Walter Cronkite School of Journalism and Mass Communication at Arizona State University, and Kyle Pope, editor and publisher of CJR, discuss Nelson’s latest report, published by the Tow Center for Digital Journalism, on journalists’ experiences with and views of newsroom social media policies.