Popularity claims
“Most popular” has no defined metric
A fictional service labels its highest-margin plan “Most popular” without recording sales, selection period or the population being measured.
Individual HTML example · Social proof
Bestseller badge follows margin rather than sales
A fictional marketplace assigns “Bestseller” to whichever item yields the highest commission, regardless of units sold.
This is an original fictional comparison. It depicts no real company and is not a legal finding or safe harbour.
Bestseller badge follows margin rather than sales
A fictional marketplace assigns “Bestseller” to whichever item yields the highest commission, regardless of units sold.
Bestseller. The badge reflects commission, not customer purchases.. Top customer choice. Claim basis, collapsed
Sponsored placement. Commercial ranking is labelled and no sales popularity is implied.. View sponsored item. Claim basis, expanded: The relevant population, period, inventory or offer state is presented with the message.. View the source and period for “View sponsored item”
Why the first version can mislead: The interface asks the user to rely on other people’s behaviour or approval. The cue “Top customer choice” has persuasive meaning only if its population, period, metric and relationship match the represented claim. The panel instead says: “The badge reflects commission, not customer purchases.” Shoppers may interpret commercial ranking as genuine purchase popularity.
What a fairer design does: Separate sponsored or commercial placement from verified sales-based popularity and state the ranking basis.
Show annotated differences (2)
Potentially problematic version
- Claim basis, collapsedIn “Bestseller badge follows margin rather than sales”, this element shows how popularity claims can shape the decision.
Neutral alternative
- View the source and period for “View sponsored item”In “Bestseller badge follows margin rather than sales”, this element keeps the clearer alternative visible at the same decision point.
Review questions (3)
- Which source record substantiates “Top customer choice”, including its population, period, metric and any commercial relationship?
- Record the claim, timestamp, data source and post-claim state; which evidence supports “It is used near a choice or recommendation”?
- Can the claim be reproduced from a defined population and period, or does the evidence instead fit “recent-activity message”?
Complete pattern context
How this example relates to Popularity claims
Aggregate popularity or approval is presented to steer a choice where the metric, population, period or basis is unclear or unsupported. The label describes a recurring design mechanism; whether a particular implementation is harmful or unlawful depends on the complete journey, audience, evidence and rules within scope.
The full guide explains inclusion and exclusion criteria, harms, fair design principles, evidence questions and the relevant EU legal information layers. The example page isolates one scenario so it can be shared and discussed without reproducing the complete library on one page.
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Activity messages
Randomised recent-purchase notification
A fictional store displays “12 people bought this in the last hour” using a random number unrelated to completed orders.
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Fabricated named signup notification
A fictional course page rotates messages such as “Mia from Berlin just enrolled” using invented names and locations rather than completed enrolments.
Sources and provenance for this example
Evidence base
Sources
- Dark commercial patternsOrganisation for Economic Co-operation and Development · Secondary · checked 2026-09-14 · OECD Digital Economy Papers No. 336
- Unfair Commercial Practices DirectiveEuropean Parliament and Council of the European Union · Primary · checked 2026-08-09 · Directive 2005/29/EC; CELEX 02005L0029-20220528