The Federal Trade Commission ordered TikTok, Snap, YouTube, Amazon and Twitter, along with four other social media and streaming sites to turn over information about how they collect and use information about users.

The far-reaching probe is aimed at exposing the algorithms and other tools that have fueled the technology companies' growth and helped them penetrate so deeply into the American psyche.

"Policymakers and the public are in the dark about what social media and video streaming services do to capture and sell users' data and attention. It is alarming that we still know so little about companies that know so much about us," three Federal Trade Commissioner said in a joint statement.

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