After the riots at the Capitol on January 6, debate is swirling over how platforms moderate content and what is protected as free speech. While some, like TikTok, directly employ content moderators, Facebook, Twitter and YouTube largely outsource the grueling work to thousands of workers at third-party companies. Some companies are relying more on algorithms to take over the dirty work, but experts say machines can't detect everything — like the nuances of hate speech and misinformation.

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Why Content Moderation Costs Social Media Companies Billions