More than 20? Or less than 75? As I scan my feedback on a recent social media post, my brain just can’t seem to help registering the number of “likes.” I’m not alone.

Under a recent settlement that Meta recently reached with states, Facebook and Instagram are about to look different for minors Among the new protections, one seemingly modest change caught my eye. By default, users under 18 will no longer be able to see likes and other reactions in response to their posts or those of others. The reforms are designed for children and teenagers, but touch on a psychological phenomenon just as relevant to adults. As a psychiatrist, I found myself wondering: Why does that little number beneath your post matter so much?

The answer has less to do with social media and more to do with an ancient human tendency: social comparison. Social comparison is the psychological process by which people assess themselves, including their own abilities, opinions, and achievements, in relation to those of others.…