Some users saw the social media app come back online on Sunday, following a shutdown when a federal law went into effect requiring a sale or ban.

President-elect Donald Trump and his running mate JD Vance appeared solemn as they placed wreaths at the Tomb of the Unknown Soldier during a ceremony at Arlington National Cemetery Sunday. "Food Wars" hosts Harry Kersh and Joe Avella travel across New Orleans to find the best seafood boil in the city.

But the law’s seeming fragility, with an incoming president already scheming to unravel it, highlights something else just as clearly: How few tools American leaders have available to address the risks of online content.