{"id":1984,"slug":"junco-2013-facebook-self-report-overestimate","title":"Junco 2013 — Facebook self-report overstates logged use by ~5.6x","kind":"reference","scope":"business","status":"current","audiences":["kevin","candid-team"],"topics":["self-report-validity"],"reference_body":"**Claim:** Junco (2013, *Computers in Human Behavior*, \"Comparing actual and self-reported measures of Facebook use\") found students \"spent an average of 26 min (SD = 30) per day on Facebook, significantly lower than the average of 145 (SD = 111) minutes per day obtained through self-report\" — a **~5.6x overestimate**. Self-report correlated with logged use at only **r = 0.59**.\n\n**Source:** Junco 2013, primary validation study. Corroborated by Parry et al. 2021 *Nature Human Behaviour* meta-analysis (106 effect sizes; \"self-reports were rarely an accurate reflection of logged media use\").\n\n**Confidence:** Verified.\n\n**Why this matters for Candid:** Even SINCERE self-reports of one's own behavior are heavily inflated when drawn from memory. The widget must therefore favor counts the owner reads off a screen (Google Business Profile, their own analytics) over recalled aggregates. See [[rule-r7-read-off-screen-beats-recall]].","rationale_body":null,"metadata":null,"links":{"outgoing":[],"incoming":[{"slug":"research-brief-smb-widget-capture-layer-june-2026","title":"Research brief: SMB widget capture layer — what owners can vs cannot self-report (June 2026)","kind":"reference","scope":"business","link_type":"relates-to"},{"slug":"rule-r4-recent-distinctive-events","title":"R4 — Ask about recent, distinctive events — not vague aggregates","kind":"rule","scope":"business","link_type":"depends-on"},{"slug":"rule-r7-read-off-screen-beats-recall","title":"R7 — When the owner can read a number off a screen, have them do so","kind":"rule","scope":"business","link_type":"depends-on"}]},"created_at":"2026-06-23T19:16:00.827Z","updated_at":"2026-06-23T19:16:00.827Z"}