Using social proof, a type of conformity where one person copies the action of another, as a part of the on-site e-commerce experience can be an effective strategy for increasing sales. A social proof strategy is essentially influencer marketing, except the focus is on real customers.

Luckily for companies — especially online retailers — they already possess a lot of content that can be used for social proof. Here are a few ways retailers can utilize this content in their email marketing programs and on their e-commerce site to influence purchases.