When involved in social media such as Facebook I have tried to maintain a Friends list of no more than 150 people because when the list gets much bigger than that I find that I have trouble keeping up with who is who! I wonder if we have limits in any social network, such as the so-called Cassette Network of the 1980s, on how many people we can maintain stable, meaningful relationships with. Below is the opening paragraph of Wikipedia's article on Dunbar's number. Please share your thoughts on your own experiences. Is this a problem at all for any of you? Or is it merely an Internet problem?
Dunbar's number is a suggested cognitive limit to the number of people with whom one can maintain stable social relationships—relationships in which an individual knows who each person is and how each person relates to every other person. This number was first proposed in the 1990s by British anthropologist Robin Dunbar, who found a correlation between primate brain size and average social group size. By using the average human brain size and extrapolating from the results of primates, he proposed that humans can comfortably maintain only 150 stable relationships. Dunbar explained it informally as "the number of people you would not feel embarrassed about joining uninvited for a drink if you happened to bump into them in a bar".