SAN FRANCISCO — Meta has prevailed over an existential challenge to its business that could have forced the tech giant to spin off Instagram and WhatsApp after a judge ruled that the company does not hold a monopoly in social networking.

U.S. District Judge James Boasberg issued his ruling Tuesday after the historic antitrust trial wrapped up in late May. His decision follows two separate rulings that branded Google an illegal monopoly in both search and online advertising, dealing yet another regulatory blow to the tech industry that for years enjoyed nearly unbridled growth.

The FTC "continues to insist that Meta competes with the same old rivals it has for the last decade, that the company holds a monopoly among that small set, and that it maintained that monopoly through anticompetit

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