When communities grow larger, self-organisation tendencies emanate, and frequently sub-communities covering more specific topics or smaller groups of friends are established.
| The formation of smaller groups within a large collective can probably be described with the rule of 150. This axiom refers to the social channel capacity, the ability of the human brain to relate factual, emotional, and social details to people. A series of social studies show that the average person can remember these features for approximately 150 individuals. |
| Psychologists explain this characteristic by using the evolution of human societies: early settlements did not comprise more than 100-150 people, and therefore the brain developed only to the point where it was able to store the information on all people in this social network. Thus, a “genuine” social network is limited to about 150 people. |
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