Word-of-Mouth and Referral Marketing Blog

I’ll Have What She’s Having: 26 Social Proofs In Marketing

social proof marketing

Social Proof is a key principle of persuasion and used everywhere in marketing, especially word-of-mouth marketing. In this, the third part of our ‘Persuasion In Marketing’ series, we list examples of the Social Proof principle being used in marketing.

Ever walked past a restaurant with a long queue outside, and joined the queue because you figured that the food was probably pretty good? If everyone is buying it, it can’t possibly be all bad, right?

That’s social proof in action. We form evaluations about something based on the actions of other people.

26 Examples of Social Proof Used in Marketing

Below are 26 examples, categorised into 5 different sources of social proof (inspired by TechCrunch):

  1. Experts – Approval from credible experts in the relevant field
  2. Celebrities – Approval or endorsements from celebrities (paid or unpaid)
  3. Users – Approval from current/past users (ratings, reviews and testimonials)
  4. ‘Wisdom of crowds’ – Approval from large groups of other people
  5. Peers – Approval from friends and people you know

A. Expert Social Proof

When we buy something that we’re unfamiliar with, we often defer to an expert’s opinion.

If a product has been reviewed and recommended by an expert in the relevant field, we are more likely to trust that review and think highly of that product.

1. Ostrich Pillow by Studio Banana Things

Ostrich Pillow Kickstarter Expert social proof Social Proof ReferralCandy

The Ostrich Pillow features testimonials by a sport psychologist and an expert in neurology and sleep, praising the pillow’s effectiveness in providing good quality naps.

Since they are the experts, they probably know better.

2. Bettingexpert


Put aside the superstitions and self-proclaimed, armchair experts. At Bettingexpert, you get an in-house team of data-driven analysts and writers to help you bet better. The site is also available in multiple languages.

3. CNET.com


Reviews on CNET are produced by both its users, and more importantly, its in-house team of tech experts. The site allows you to compare reviews by both parties.

Back to 26 Examples of Social Proof in Marketing

B. Celebrity Social Proof

Celebrities are walking advertisements, so any product that they recommend or are seen using are bound to get a lot more attention.

Unpaid endorsements

4. Mark Zuckerberg and iGrill

iGrill mention by Mark Zuckerberg Unpaid Social Proof ReferralCandy

A Facebook post by Mark Zuckerberg about a grilling thermometer, iGrill, crashed the product website with 1000 visitors entering the site every minute!

According to an article by Mashable, the iGrill folks had no idea Zuckerberg was even a customer.

iGrill CEO Christopher Allen said their app downloads exploded after the mention, and it raised awareness about their brand a million-fold.

5. Stars drinking Starbucks

Starbucks Celebrities Unpaid Social Proof ReferralCandy

Not that Starbucks needs more advertising, but the fact that celebrities are often spotted with a latte in their hands reinforces the social impression that Starbucks equals cool.

6. The ‘Colbert Bump’


During his nine-year tenure as the acerbic host of the Colbert Report, Stephen Colbert regularly gave the ‘Colbert Bump’ to unsuspecting guests and products, boosting their support and visibility.

The effects of the legendary ‘bump’ have been well documented. According to NBC News, politicians who received the ‘bump’ saw a surge in popularity.

When Colbert decided to undercut a book publishing feud between corporate giants Amazon and Hachette, he bestowed his ‘bump’ on books written by new authors and sold by an independent retailer. Said authors reported phenomenal increases in sales for their once obscure novels.

7. Saoirse Ronan and Tropical Popical


During her interview on the Ellen show, acclaimed actress Saoirse Ronan showered Tropical Popical, an Irish nail salon, with more fanfare and customers it had ever received.

In an article by Phorest, the owner of Tropical Popical revealed how customers began to boast of their visits to the salon after Ronan’s endorsement.

Paid endorsements

8. Samuel L. Jackson and iPhone 4S

Some of us are skeptical of paid endorsements, but Apple does a very good job with this ad. Samuel L. Jackson has played a lot of cool and bad-ass characters, so people are already inclined to find him endearing. Samuel L. Jackson cooking, however, takes endearing to a whole new level, in a manly-cute sort of way.

9. Liam Neeson and Clash of Clans

Like Samuel L. Jackson and Apple, popular mobile game Clash of Clans enlisted Liam Neeson, another actor of gravitas. The juxtaposition between Neeson’s strong-man persona and the game’s cartoonish animation proves surprisingly adorable.

Adorable enough to have you exterminate rival clans while commuting to work.

Back to 26 Examples of Social Proof in Marketing

C. User Social Proof

In a consumer study conducted by the folks at BrightLocal, they found that 88% of consumers read online customer reviews to determine if a local business is good.

The study also mentioned that 85% of consumers read up to 10 reviews before they feel they can trust a certain business.

Because customers are unable to physically try out a product on an online store, it makes sense that they would rely on previous customers who have bought and tried them out.

Building up your customers’ trust in your product will determine if they will buy it, and even manage their expectations when they eventually receive it.

User Reviews

10. Cotopaxi

Cotopaxi Customer Reviews Social Proof ReferralCandy

Cotopaxi customers can leave reviews on individual product pages, as well as give a rating of 1 to 5 stars.

Additionally, other users are able to give a thumbs up or down to reviews that they find useful.

This way, even the reviews have a social proof element to them!

However, don’t be afraid of negative reviews.

A Forbes article has mentioned that brands with polite but negative reviews can actually be perceived as being “more honest, down-to-earth, cheerful, and wholesome” than one without any complaints.

In the same study by BrightLocal, they found that 30% of customers will “trust a customer review just as much as a personal recommendation if they believe it to be authentic”!

11. SKYTRAX’s Airlinequality.com


Think of Skytrax’s site as the Yelp of airlines and airports. The website allows users to review airlines and airports all around the world. These reviews are also subjected to quality control by other users. In this way, you can optimize your flying experience.

12. Netflix



Before you chill, you need to Netflix. And what contributes to the latter’s allure is its user reviews. Every movie in Netflix’s DVD section comes is accompanied by a section filled with remarkably in-depth film reviews by the site’s subscribers.

Read next: How Netflix Achieved A 70 Million Subscriber Rate – Through Word-of-Mouth

User Ratings

13. Google Play Store

Google Play Store Ratings Social Proof ReferralCandy

Apart from the usual rating system, the Google Play Store actually lists the total number of people who have given that particular star rating.

Showing the number of people who have given it 5 stars accompanied by 5-star reviews suggests how awesome this app is, and how much people like it.

Of course, you don’t have to create your own rating and review system for your website.

If you’re looking for services that provide customer ratings and reviews, check out Yelp or Yotpo!

14. IMDb


IMDb, the premier online database for film and television, lists and breaks down the user ratings for every entry. For example, with Batman v Superman, you can see which particular audience demographic loved the movie, and which thought it was a bloated, dull-fest of over-saturated colours and migraine-inducing cinematography.


15. ReferralCandy

ReferralCandy Testimonials Social Proof ReferralCandy

Testimonials allow you to put your best foot forward.

You present the most positive reviews by your most prominent customers, so that it’ll command the most social proof.

Providing some details about the customer giving the testimonial might be able to attract similar customers as well.

For instance, a Shopify store owner might find the testimonial by Wear Viral more valuable that the one by George Yury Revutsky.

Depending on who that client is, it could even work like an expert or celebrity social proof!

16. LinkedIn


On a human level, Linkedin allows its users to write each other testimonials and recommendations.

Considering that most users of Linkedin are skilled professionals, a good word from them can serve as lived, real-time proof of your skills and work ethic.

Back to 26 Examples of Social Proof in Marketing

D. ‘Wisdom of the Crowds’ Social Proof

‘People who bought this also bought that’

17. iTunes store

iTunes Store Listeners also bought Social Proof ReferralCandy


Simple and effective.

18. Amazon

Amazon Customers also bought... Social Proof ReferralCandy

Listing what other customers also bought apart from that product can be really useful.

I have personally found myself simply clicking on several suggested items because they are similar to what I’ve already chosen!

We tend to trust people who have similar interests and tastes, so we probably trust that whatever else they bought would be something we might like as well.

19. Book Depository


Discover the books purchased by your fellow like-minded users. Most often, these books come with discounts as well.

“These are our best-sellers!”

20. Pura Vida

Pura Vida Best Sellers Social Proof ReferralCandy

Providing a ‘best selling’ category can be very useful, especially for customers who do not have a specific item in mind.

A best-seller category can sometimes serve to showcase what your brand does best, and first-time customers are usually comfortable with buying something that most people have bought.

Of course, it’s always an added bonus if you can provide their customer ratings and reviews!

21. The New York Times Best Seller Lists


Perhaps, one of the most well-known example of this category is the New York Times’ Best Seller list, which already has a life of its own. Books featured on the list gain both prestige and sales. If it’s good enough to be on the list, it’s probably good enough for you to buy it.

‘Bought by X amount of people’

19. Kickstarter

A Kickstarter Social Proof ReferralCandy

Every Kickstarter project listed on the site will show how much funding they have received, and how it is doing relative to their initial funding target.

For instance, The Micro 3D printer project hit 6803%, or 68 times their initial target!

We do not know if the project owners had unquoted their target, but we get a rough sense of how popular this project is, especially when compared with other projects!

B Kickstarter backers Social Proof ReferralCandy

Clicking on an individual project provides clearer social proof information by listing the total number of people who have backed that project.

All Kickstarter projects have a time-limit, so ongoing projects will list the amount of time left for customers to support that project.

This creates a sense of urgency, as most projects offer exclusive discounts and incentives during their crowdfunding window.

“Served X number customers so far!”

20. McDonald’s

McDonald's Billions Served Social Proof ReferralCandy
Image was taken from ‘Over How Many Billion Served?’

Telling people how many customers you served so far is perhaps the simplest form of social proof.

McDonald’s “Drive-Thru” displayed their number of customers served in millions, and later followed by the billions. Some signs simply stated, “billions and billions served”.

Would you buy a burger from a fast-food chain that has served billions of customers? Of course, you would!

“Join others just like you who’re benefitting from this!”

21. Shopify blog

Shopify blog popup social proof ReferralCandy

Stating figures that aren’t rounded up gives the impression that the stats are genuine and maybe even updated regularly.

Back to 26 Examples of Social Proof in Marketing

E. Peer Social Proof

We know that customers trust recommendations from people they know much more than strangers.

An experiment by Dr. Cialdini found that people were much more likely to participate in a door-to-door donation campaign if the donor list included their friends and neighbors.

“Your friends have tried/visited this!”

22. TripAdvisor

Trip Advisor Facebook friends Social Proof ReferralCandy

When customers log in to their Facebook account from TripAdvisor, it shows them the locations their friends have been to, and which ones they are willing to recommend.

This makes it easier for a customer to decide it it’s their first time visiting that particular destination.

Additionally, they can also read the reviews left by their friends before they make their decision.

23. Airbnb


When users browse Airbnb, they can check which homes are popular, affordable, and well-received.

A user can see the reviews and recommendations left by their friends or strangers. This ensures that your holidays and staycations won’t be ruined by misleading advertising and problematic homeowners.

24. Yelp


Yelp does a thorough job of aggregating and sorting user reviews according to various, relevant criteria. Users can see which restaurants their friends have tried. Additional information on the restaurants (e.g. opening hours, price range) is also displayed.

Yelp’s user reviews are so detailed that they have been known to make or break a restaurant’s fortunes.

25. Foursquare


Pretty much everybody you know has used or heard about Foursquare. The ‘search-and-discovery’ site (and app) covers almost everything under the sun. Discover what your friends and other visitors have had to say about various locations. Best thing about Foursquare is that you’ll be able to find out (via your fellow users) all the secret Wifi passwords and travel destinations.

“Your friends have like/shared this!”

26. Bustle.com

Bustle Facebook friends Social Proof ReferralCandy

Similar to TripAdvisor, Bustle.com shows you which of your Facebook friends have liked their Facebook page.

While there probably isn’t much utility in liking their page, it does give the impression that their site is popular among your peers and strangers alike.

Back to 26 Examples of Social Proof in Marketing

Power up your marketing with as many of these examples as possible.

One of the best things about this principle is that you can use multiple sources of social proof to amplify your brand’s perceived popularity and credibility.

Do note that customers who do not know much about a product and isn’t sure about which one to buy is very likely to reply on the opinion of others.

They might feel compelled to simply go with the popular choice.


Samuel Hum

Samuel Hum

As a finalist in Esquire's Best Dressed Real Man contest, Samuel is ReferralCandy's fashion eCommerce expert and resident sartorialist. He is obsessed with human behavior, social psychology, and handstands. He is also the lead calisthenics trainer at Weightless.


  • Social proof I think is one of the quickest and most powerful ways to instantly become more credible. If you’re a business, for example, and you have customers who talk about you, having their pictures and quotes instantly warms up an otherwise cold site.

    I’d go so far as to say– everybody who’s running any sort of site or product ought to take some time to go through their interactions and look for opportunities to get social proof. It’s an easy win, and it goes a long way– and you can strengthen relationships with people!