Syndrome Cluster · Cognitive Impact
Social Comparison & Body Image
Measured effects of curated, filtered, algorithmically-amplified peer content on self-evaluation, body satisfaction, and disordered eating risk.
6studies on file
4peer-reviewed
1replicating
1contradicting / hypothesis
2compounding platforms
The strongest tier on file: published studies in peer-reviewed venues whose primary outcome bears directly on this cluster. If a claim is not here, it did not clear the bar.
2023
Media Psychology
McComb, Carly A.; Vanman, Eric J.; Tobin, Stephanie J.
Multilevel random-effects meta-analysis of 48 experimental articles (118 effect sizes, n=7,679) examining the causal effects of exposure to upward comparison targets on social media on self-evaluations and emotions. All included studies used random assignment. Found a significant overall negative effect (g=-0.24) of upward comparison vs controls on self-evaluations and emotions. Body image showed the strongest specific effect (g=-0.31). Findings support causal inference because the underlying studies are experimental.
Brief exposure to idealised Instagram body content produced measurable increases in state body dissatisfaction relative to control images.
Replications & corroborations (1)
confirms
Fardouly J, Diedrichs PC
Verduyn, Philippe; Lee, David Seungjae; Park, Jiyoung; Shablack, Holly; Orvell, Ariana; Bayer, Joseph; Ybarra, Oscar; Jonides, John; Kross, Ethan
Two-study investigation of whether passive versus active Facebook use differentially affects well-being. Study 1: laboratory experiment cueing passive use caused declines in affective well-being. Study 2: experience-sampling study in the field replicated the effect and identified envy as the mediating mechanism. Active Facebook use (direct communication, posting) showed no significant effect on well-being. The passive-use effect remained significant after controlling for active use, non-Facebook social network use, and direct social interactions.
Kross, Ethan; Verduyn, Philippe; Demiralp, Emre; Park, Jiyoung; Lee, David Seungjae; Lin, Natalie; Shablack, Holly; Jonides, John; Ybarra, Oscar
Experience-sampling study of young adults using Facebook. Participants were text-messaged five times daily for two weeks to assess Facebook use and the two components of subjective well-being (momentary affect and life satisfaction). Found that Facebook use predicted within-person declines on both components: more Facebook use at one time point predicted worse next-prompt affect; cumulative use predicted declining life satisfaction over the two-week study window. Direct in-person social interaction, included as a control, did not predict these negative outcomes -- isolating the Facebook-specific effect.
Replications & corroborations
1
Independent attempts to re-test the findings above. Successful replications strengthen the chain; failures and partial replications weaken it. Both are listed, because you are entitled to see the ones that did not work.
Pre-registered replication confirms the directional body-dissatisfaction effect with a smaller, more conservative effect-size estimate.
Contradicting evidence & hypothesis-tier reports
1
Lower-tier reports, contradicting findings, and hypothesis-flagged clinical observations. Read with the diagnostic caveats — none of these are settled science.
Meta Platforms internal research; reported by Wells G, Horwitz J, Seetharaman D (Wall Street Journal)
Compounding effects — every platform touching this domain
2
Somebody using all of these surfaces is not exposed to one risk source. They are exposed to every one of them at once, and no study has measured the compound, because no study could. Each row links to that platform's full dossier and to the entity that owns it.
