More than 1,600 plaintiffs accuse the owners of Instagram, YouTube, TikTok and Snap of knowingly designing addictive products harmful to young users’ mental health.

TikTok reached an agreement late Monday to settle a lawsuit over claims that social media companies had engineered their products to hook young users, avoiding the first in a series of landmark trials...

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...