In today’s world, humans use social media to connect with thousands of people online. This might make them believe that they can have endless friendships, but human brains actually have a limit. Truthfully, the human ability to keep up with true deep relationships is not unlimited. The difference between our vast online networks and our actual biological constraints is explained by a key scientific concept known as Dunbar’s number.

   Dr. Robin Dunbar’s theory is based on the neocortex, the advanced part of the brain responsible for our language and social skills. This part of the brain is powerful but has a fixed limit on how much information it can process. Dunbar’s number, which is about 150, represents the limit of friendships one can have. This number does not just represent the number of faces you can recognize, but the number of friendships you can truly maintain at a higher level. A friendship is a reciprocal relationship, an effort made by both people. Maintaining a reciprocal friendship requires significant mental effort. Constantly tracking an individual’s history, current emotional state, and details of shared experiences. This difficult mental checklist is what places the hard limits on social lives.

   The social limit of 150 does not just represent one specific group; it actually reflects the amount of emotional effort put in. Studies say that the most essential circle holds your five closest friends. The next layer is a 15-person “sympathy group” which details the friends you hold most close after your first five. Then the group grows to a 50-person “good friends” group. Lastly, ending with the other roughly 90-person group of acquaintances.  

      A key finding is that while social media enables a vast network of weak relationships, these platforms do not increase the number of emotional relationships one has. The frequency of genuine communication will still fall into the established tiers. Ultimately, our minds are hardwired for a smaller, intimate community. Attempting to exceed the 150 limit often means that the rest of the relationships have become superficial. Therefore, the most critical takeaway is to focus your energy on a select group of high-quality people rather than seeking quantity.