The internet can be a scary place for women, from mansplaining and unwanted advances to coordinated harassment campaigns, doxxing and physical threats. Marketplace’s Meghan McCarty Carino speaks with Nina Jankowicz, author of a new book about this, “How to Be a Woman Online: Surviving Abuse and Harassment, and How to Fight Back,” which comes out Thursday. Jankowicz says women are bearing most of the burden of fighting online trolls.