Why should there be at least 100 people in a CoP?

In a typical community, 10% or fewer of the members will tend to post, ask questions, present, etc. If a CoP has only 10 members, that means that only one person will be doing most of the activity. In a CoP of 100, you can expect around 10 people to be active, and that is probably the minimum number for success. As the community grows in size, it becomes more likely that experts belong, that questions will be answered, and that a variety of topics will be discussed. Also see this thread.

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