They spoke broadly about the conflict, the protests it has generated, the Middle East and more but did not touch on antisemitism online. Mr Netanyahu, who urged a rollback of such hatred in a September meeting with Mr Musk, said he hoped the billionaire would be involved in building a better future. Mr Musk replied, “I’d love to help.” Mr Herzog did confront Mr Musk, saying that “the platforms you lead, unfortunately, have a huge reservoir of hatred, hatred of Jews and antisemitism.” The Israeli president was joined in the meeting by some of the families of hostages held by...