• Florida Shooter: When Social Media Foretells a Mass Shooting

    Disturbing social-media posts apparently made by school shooter rekindle debate about tech companies’ responsibilities to detect threats

    Disturbing social-media posts apparently made by Nikolas Cruz before a deadly shooting spree have rekindled questions about what responsibilities and capabilities technology companies and law-enforcement authorities have for detecting threats among the billions of words, images and videos online.

    Mr. Cruz on Thursday admitted to gunning down 17 people the day before at a Florida high school.

    Months...

    Popular on WSJ