In today’s world, when you can have 4,000 “friends” on Facebook, it is hard to determine the true definition of friendship. Knowing 4,000 people (and even only 1,000) does not mean you are friends. It means you know of, or maybe even have been acquainted with, that many people. Sometimes, you share nothing in common other than you happen to have a mutual contact. You might not have even met!
Professor Robin Dunbar, an anthropologist at the University of London, tried to find the answer to the question “How Many Friends Can We Really Have?” He found that there is a limit to how many friends we can have with whom we can maintain meaningful relationships. Dunbar claimed that we can only have relationships with an average of 150 people for them to be considered stable, effective social relationships. This is called Dunbar’s Number.