Social proof is a psychological concept that describes how the actions and opinions of others influence people. In social media, social proof takes the form of likes, comments, shares, and other interactions. When people see that a post or piece of content has been liked or shared by many, they are more likely to engage with it. This is because we tend to view things that are popular as being more valuable, interesting, or important. Social proof is a powerful tool that can be used to increase the reach and engagement of your content.

Example

For example, someone might like to buy a product if they see that their friends have liked it on Facebook, or they might be more likely to follow a particular person on Twitter if they see that many other people are already following them.