More than a third of women report personal experiences with online violence. This month, Facebook, Twitter, TikTok and Google all signed on to new commitments to address online abuse and women’s safety on the web. The companies say they will test out new tools, including one that would give users the chance to put the brakes on a video that unexpectedly goes viral. Facebook, Twitter and Google didn’t make specific pledges about when they would be testing the new tools, but TikTok said its tests will start as early as this year.