I thought this would be some kind of secret, not-for-sale special sauce.

Edit: As people have said on the comments, the repo has not been updated since it was uploaded. So to say it is the current Twitter algorithm would be disingenuous. I have since changed the title to reflect on that

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[–] 4 points 1 day ago

Given the e2ee is basically the same as signals I'm fairly confident that part is secure. However you still need to trust the app as a whole because it has access to all the unencrypted data. If Meta slip up or are found out leaking what is supposedly protected it would erode trust pretty quickly and they will lose one of the most important data sources they have (the social graph of phone numbers).

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