The social networking giant projected it could spend $10 billion annually on Anthropic’s tools, illustrating the friend-foe relationships underlying the A.I. race.

Meta, the social media giant, agreed to change the way children interact with its apps. That could be trouble if its competitors don’t abide by the same rules.

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Psychologists said the changes were a symbolic victory, but warned their effectiveness might be limited.

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Governments around the world have passed or proposed a range of bans or restrictions on young teens using addictive social media platforms.

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