Multiple social media platforms face a first-of-its-kind trial in a Los Angeles court this week, facing accusations that their platforms are designed to be harmfully addictive. The landmark case centers around claims from a 19-year old,

Tuesday marks the start of a landmark trial in a lawsuit claiming that social media companies are using addictive technology to hook children.

The case being heard in a California state court in Los Angeles is being called a "bellwether" proceeding because its outcome could set the tone for a tidal wave of similar litigation across the Unite...