A new study shows that if a person leaves a social media platform like Twitter, or never joined, the online posts and words of their friends still provide about 95% of the "potential predictive accuracy" of a person's future activities, even without any of that person's data.

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A new study shows that if a person leaves a social media platform like Twitter, or never joined, the online posts and words of their friends still provide about 95% of the "potential predictive accuracy" of a person's future activities, even without any of that person's data.