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Social Proof Works: Here’s Why.

Activation in the motor cortex during motor im...

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One of the major psychological foundations for the purported effectiveness of social media marketing is social proof. The idea is fairly simple: people are more likely to find a product or service appealing if there is evidence that other people find it desirable. Robert B. Cialdini, in his very popular Influence: Science and Practice, describes social proof as

an important means that people use to decide what to believe or how to act in a situation by looking at what other people are believing or doing.

We’re social animals, and signals from our peers as to the desirability of particular objects has a significant influence on whether we want them too. In social networking, this principle is put into practice through the pursuit of “likes” or “+1s”, and through an active pursuit of conspicuous evidence of engagement and approval for products and brands among consumers.

However, many business owners are somewhat dubious as to the value of pursuing social proof on social networks as opposed to investing in more traditional methods of marketing. To a degree, their skepticism is valid. Businesses are not interested in how many people “like” their brand, if that approval doesn’t result in conversions. “Likes” are worse than worthless if the result is not an increased conversion rate in the medium to long term. Pursuing “likes” for their own sake is indeed less effective than working towards establishing a community of engaged and enthusiastic consumers, but there is significant evidence, both theoretical and neurological, that social proof does have an impact on shaping desires and goals – so-called goal contagion.

René Girard, a French historian and philosopher, posited the concept of mimetic desire to explain where desires originate. Girard was mostly concerned with literary analysis and philosophy, but mimetic desire as he construes it has considerable bearing on social proof. Girard believes that all human desires are provoked by the desire of another individual. That is, we don’t have desires at all unless it’s demonstrated that similar desires exist in other people.

This should make intuitive sense to marketers whose job is to manufacture desire. Targeting marketing at vocal early adopters, who then communicate the desirability of a product to increasingly expanding circles, is a tried and tested technique for generating interest. The same principle can be applied to social networking. A sufficient quantity of conspicuous approval on social media can help to create approval in users.

Earlier this year, a group of neuroscientists from the Institut du Cerveau et de la Moelle épinière in Paris, including Mael Lebreton and Baudouin Forgeot d’Arc, among others, put Girard’s theory to the test. They tested a group of subjects by having them carry out various tasks while being scanned with an fMRI machine, which allows scientists to measure brain activity. The results seemed to support Girard and Cialdini’s contention, and suggest a neurological mechanism by which mimetic desire and social proof works.

You should take a look at the original paper for an in-depth explanation of the methods and results, but to summarize, the experimenters observed that the subjective desirability of objects increased after individuals perceived that those objects were the goals of another person’s actions. That is: if someone wants an object, other people’s desire for it increases. This happens because the part of our brains which mirrors the actions of other people (the mirror neuron system) has an effect on the part of our brain that determines value (Brain Valuation System in the ventral striatoprefrontal network).

The take-home message here is that social proof and conspicuous endorsement and displays of approval on social media are likely to have positive effect on conversion rates.