19 · Deciding
Social Proof
When people aren't sure what to do, they look at what people like them did.
Evidence: Holds, with limitsWhat we do with it
- 01
Specific beats general. A named client and a real result say more than “trusted by thousands”.
- 02
Show people like the visitor. Proof from a different kind of customer can work against you.
- 03
Never invent it. Made-up reviews, inflated user counts and fake “someone just bought this” pop-ups are out.
- 04
Be careful with “most people don't do this”. Telling people a bad habit is common can make it seem normal.
Examples
Getting it wrong, getting it right.
Don't
“Trusted by 10,000+ teams” with no names and nothing to check.
Do
Three named clients, with what changed for each.
The evidence
What the research says.
The general effect is well supported; the details are touchy. The 2008 hotel-towel result didn't repeat when Gerd Bohner and Lena Schlüter tried it in 2014. Then Benjamin Scheibehenne and colleagues pooled seven towel experiments in 2016: each was weak alone, but together they gave strong support for a modest effect, about 6 percentage points more reuse.
How our view changed
We use proof that's specific and can be checked. We don't expect a vague “thousands of happy customers” line to do much.
Sources
- Cialdini, R. B. (1984). Influence: How and why people agree to things. William Morrow.
- Goldstein, N. J., Cialdini, R. B., & Griskevicius, V. (2008). A room with a viewpoint: Using social norms to motivate environmental conservation in hotels. Journal of Consumer Research, 35(3).
- Bohner, G., & Schlüter, L. E. (2014). A room with a viewpoint revisited: Descriptive norms and hotel guests' towel reuse behavior. PLOS ONE, 9(8), e104086.
- Scheibehenne, B., Jamil, T., & Wagenmakers, E.-J. (2016). Bayesian evidence synthesis can reconcile seemingly inconsistent results: The case of hotel towel reuse. Psychological Science, 27(7).
Last reviewed November 7, 2026. How we keep this current