"Large group" could be as small as 200 or 300, or perhaps as low as 151.

A website operator who wants to publish pages managed and edited by 150 of his "friends" would be acceptable.

A website operator who wants to hand out pages to 100,000 people would not be acceptable.

https://journals.plos.org/plosone/article?id=10.1371/journal...

https://arxiv.org/abs/1105.5170

https://arxiv.org/abs/1011.1547

https://pdodds.w3.uvm.edu/teaching/courses/2014-01UVM-303/ou...

https://www.newyorker.com/science/maria-konnikova/social-med...