Yep, Dunbar's number is what you are looking at for this phase change:
https://en.wikipedia.org/wiki/Dunbar%27s_number
So around the 150-200 mark.
So around the 150-200 mark.
1. I know who he is, and he knows who I am.
2. I don't know who he is, but he knows me.
3. Neither of us has any idea who the other one is.