Marketing Evidence · coming soon
Check any marketing stat before your client does.
We traced 72 of the most-repeated US marketing statistics back to their original sources. 14 of 72 hold up as quoted. We also keep 34 verified reference facts (Pew, Census, IAB/PwC, FTC and others), each with an as-of date. Paste a stat and get the primary source, method, sample, date and a confidence level. You get the source, not a bare verdict.
21 unsourced · 14 misquoted · 23 outdated · 48 verified
Findings
- Misquoted confidence: highInfluencer marketing returns $5.78 for every $1 spentOrigin: Influencer Marketing Hub, 2020 (2019 data)
- Outdated confidence: highBusinesses make $6.50 for every $1 spent on influencer marketingOrigin: Tomoson, 2015
- Outdated confidence: highEmail marketing returns $36 for every $1 spentOrigin: Litmus, 2020
- Misquoted confidence: high92% of consumers trust influencers, UGC or word of mouth more than adsOrigin: Nielsen, 2012 (fieldwork 2011)
- Misquoted confidence: high61% of consumers trust influencer recommendations vs 38% for brandsOrigin: Matter Communications, 2020
- Verified confidence: highUS creator economy ad spend reaches $37B in 2025Origin: IAB, 2025
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For marketers & agencies
Clean decks and posts that survive a "where's that from?" Each page includes a safe rephrasing you can paste.
For AI agents
Free MCP server (https://groundedkit.com/mcp), JSON API, llms.txt and a SKILL.md template that makes agents cite primary sources. Read the agent guide →
Free template
Download “Primary Source Finder for Marketing Claims” (.zip) · View SKILL.md