I’m suing social-media platforms like Snapchat — so someone else’s child doesn’t die like mine did

I never imagined I would be a plaintiff in the landmark social-media-addiction trials that started last week in Los Angeles. But when your daughter is taken from you tragically because of a dangerous product that targets kids, you have no choice but to fight back.  That’s why I am one of more than 1,600 parents, school districts...