Meta founder and CEO Mark Zuckerberg took the stand Wednesday to defend his company’s practices in a landmark trial that could determine whether social media companies can be held liable for alleged harms to children. But if the defendants lose, the implications could extend far beyond social media.

The case centers on Meta and Google, with plaintiffs alleging that services like Instagram and YouTube are intentionally designed to keep users, especially kids, engaged—a dynamic they say can lead to harmful mental health effects, including addiction. The trial is widely viewed as a test case for roughly 1,500 similar lawsuits waiting in the wings. Meta and Google deny the charges, with Zuckerberg testifying on Wednesday that........

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