Is a blue square popping up on your social media feed? Here's what it means. Example video title will go here for this video WASHINGTON — A non-profit foundation is launching a major campaign against antisemitism, featuring hundreds of social media influencers and celebrities in an effort to fight rising hate crimes against Jewish people. The Foundation to Combat Antisemitism's new campaign, which uses the hashtag #StandUpToJewishHate, is centered around a simple concept: a blue square. It's all meant to mobilize Americans, especially those who aren't Jewish, to stand up against antisemitism. The hope is that the blue square icon,...