My husband (who is well into the 140s) said that we cannot have meaningful conversations with anyone that is outside of 30 IQ points of another. This is why those that fall into the 140+ range find the entire world difficult to be in. LOL People in the world with 110-120 IQs get along "socially" the easiest it seems.
Cool concept (even though IQ is a very poor measure of intelligence). It seems to be related to rpietila's rabit hole metaphor. I want to add that you can communicate with people outside your range. It's just tiring and not intellectually rewarding (but can be socially rewarding to some in certain situations).