France's Constitutional Council didn't strike down the principle of banning under-15s from social media on Friday. It struck down the mechanism, and that distinction points to a problem no country has actually solved yet: how do you verify a user's age without forcing every adult to hand over identifying data too?

The Council specifically censured Article 1 of the law, ruling that the ban's "general and absolute character" made it a disproportionate restriction, an argument originally pushed by the leftist........

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