What is the network effect: The network effect is a phenomenon whereby increased numbers of people or participants improve the value of a good or service. However, as more users gained access to the Internet, they produced more content, information, and services

loop theory:

what is Dunbar’s number: 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.