Zuckerberg Gets a Crash Course in Charm. Will Congress Care? by KEVIN ROOSE, CECILIA KANG and SHEERA FRENKEL

Mark Zuckerberg, Facebook’s chief, faces his biggest test yet: two days in the hot seat on Capitol Hill. The company has pulled out the stops to make sure he’s ready. By KEVIN ROOSE, CECILIA KANG and SHEERA FRENKEL from NYT Technology