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We have checked the size of Second Life groups (counted the number of members) for more than 100,000 groups. Some are quite large. There are even a few groups that have more than 10,000 members. But most groups (65%) do not have more than 20 members.

There are some issues with large groups, so it's strange that residents are not removing themselves from those groups and that they still exist.

Effective groups should not be larger than 150, and the optimal group size is around 45-50. This number is based on some research done by Robin Dunbar which might also be applicable to virtual worlds.

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