The power of social proof can be seen in several contexts. When it comes to online business, it’s a valuable marketing tool.

For example, if you need a new cell phone, you might visit an eCommerce website to buy one. On this website, let’s say that you’re offered two products. The first product has a 5-star rating and three reviews with a tag showing "New Product." The second product has a 4.6-star and 475 reviews with a tag showing "1000 products sold within 24 hours."

Which one would you buy? You’re more likely to pick the second one if you're motivated by social proof.