--- title: Word of Mouth (WOM) — definition | RGM® Glossary url: https://realgrowthmatters.com/glossary/word-of-mouth/ updated: 2026-06-10 source_html: https://realgrowthmatters.com/glossary/word-of-mouth/ --- # Word of Mouth (WOM) word of mouth/wəɹd əv maʊθ/noun The channel older than language had a name for it — and still the one buyers trust most. Term : Word of Mouth (WOM) Abbrev. forms : WOM, WOMM (the marketing of it) Science base : Berger's STEPPS, referral economics Trust rank : Top of every trust survey ## Forms & parts of speech WOM · acronym The peer-recommendation channel. "Track **WOM** honestly — 'how did you hear about us' beats the attribution model here." ## Definition in plain terms Word of mouth is people recommending (or warning about) products to each other — conversation as distribution. It is marketing's most trusted channel in every survey for the same structural reason: the recommender has no incentive, so the signal carries. WOMM — word-of-mouth marketing — is the discipline of earning, amplifying, and occasionally engineering it without breaking the thing that makes it work. ## The mechanics The research mapped what spreads and why: Berger's STEPPS (social currency, triggers, emotion, public, practical value, stories) names the drivers; the operational levers are remarkable-by-design products (the Purple Cow argument), referral programs that formalize the ask (Dropbox's two-sided storage bonus remains the canon case), shareable moments engineered into the experience, and community where conversations compound. Measurement is honestly hard — most WOM happens in 'dark social' (chats, DMs, conversation) — so the working proxies are 'how did you hear about us' fields, referral-code redemption, branded-search growth, and K-factor where loops are instrumented. ## When it matters WOM matters most where trust gaps are widest — considered purchases, new categories, anything bought on others' experience (restaurants, B2B software, doctors). It compounds where customer density creates conversation probability (campuses, industries, cities — the beachhead logic again). The governing law is conservation of authenticity: paid amplification of real advocacy works; manufactured advocacy (undisclosed incentives, fake reviews) destroys the trust premium that made the channel valuable — and regulators now fine the attempt. **Worked example.** A B2B tool with happy users and no referral motion formalizes the ask: a two-sided incentive (both parties get a month free), triggered at the moment of proven love (right after a high NPS response or a third project completion), with a one-line message users can send unedited. The 'how did you hear about us' field gets mandatory and honest. Within two quarters, referred signups hit 22% of new revenue — converting at twice the paid rate, churning at half — and the field data shows the real driver: a specific workflow moment users describe identically. Marketing finally amplifies the exact sentence customers already say. **Failure modes to watch.** Buying fake advocacy and renting the FTC's attention; asking for referrals before the user has experienced value; ignoring the 'how did you hear' field while staring at attribution models; and engineering shareability into a product nobody would mention sober. ## Synonyms & antonyms ### Synonyms word of mouthWOMpeer recommendation ### Antonyms paid mediamanufactured advocacy (the counterfeit) ## Origin & history The phrase 'by word of mouth' is recorded in English from the 16th century — oral transmission as opposed to writing. Its marketing formalization is modern: George Silverman's 1970s 'teleconferenced peer influence groups' pioneered the practice, his *Secrets of Word-of-Mouth Marketing* (2001) and the founding of WOMMA (2004) named the discipline, and Berger's research gave it a science. Etymology: [source](https://en.wikipedia.org/wiki/Word-of-mouth_marketing). ## Usage trends Search interest for this term over the last five years: [View interest-over-time on Google Trends →](https://trends.google.com/trends/explore?q=word%20of%20mouth%20marketing&date=today%205-y) ## Common questions What is word of mouth? : People recommending products to each other — the unpaid peer channel that tops every trust survey. Can word of mouth be engineered? : Earned and amplified, yes — remarkable products, referral programs, and shareable moments. Faked, no — counterfeit advocacy destroys the trust premium. How is WOM measured? : Imperfectly — 'how did you hear about us' responses, referral redemptions, branded-search growth, and K-factor where loops are instrumented. ## Related tools & calculators - tool[Funnel drop-off analyzer](/tools/funnel-drop-off-analyzer/) ## Resources & people to follow - book*Contagious* — Jonah Berger (the science) - book*Purple Cow* — Godin (the product half) - referenceFTC Endorsement Guides — the disclosure law Curated, non-competitor resources verified per term. ## Related training - module[Growth marketing foundations](/training/growth-marketing-foundations/) ## Disciplines Areas of marketing where word of mouth (wom) is a core concern: [Channels](/training/growth-marketing-foundations/)[Brand strategy](/training/growth-marketing-foundations/) ## Read next ## Related terms [Jonah Berger](/glossary/jonah-berger/)[Contagious (book)](/glossary/contagious-book/)[K-factor](/glossary/k-factor/)[Referral program](/glossary/referral-program/)[Net promoter score](/glossary/net-promoter-score/) ## Sources 1. trends[Google Trends — "word of mouth marketing"](https://trends.google.com/trends/explore?q=word%20of%20mouth%20marketing&date=today%205-y)