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Their findings were incredibly granular. They found that fashion and beauty content produced negative feelings in ways that adjacent content like fitness did not. They found that “people feel worse when they see more celebrities in feed,” and that Kylie Jenner seemed to be unusually triggering, while Dwayne “The Rock” Johnson was no trouble at all. They found that people judged themselves far more harshly against friends than celebrities. A movie star’s post needed 10,000 likes before it caused social comparison, whereas, for a peer, the number was ten.
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Jeff Horwitz (Broken Code: Inside Facebook and the Fight to Expose Its Harmful Secrets)