There's faith Meta will keep their promise, on a landmark $18 billion US dollar settlement.

It cuts short a trial in a federal court in California brought by 29 US states over teen social media addiction.

Instagram and Facebook will need to introduce daily limits and night-time blocks for teen users.

Sydney University Associate Professor Dr Rob Nicholls says if Meta breaks the agreement, it'll be in contempt of court.

"They weren't on a really great track - that might be because both sides knew that there was a negotiation in the wings, and ready to be settled." 

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