Are highly intelligent people often more lonely?

Do you think being highly intelligent can be a curse socially? Do you think it can make forming relationships more difficult?

This is something I was reflecting on. The reason being because I was talking to a good friend, who is a brilliant scientist,and her take on it was that whilst she derives a great deal of satisfaction and pleasure from her work, and her ability to be innovative; she feels that socially she would be happier, if she deviated less from the average. I am curious if this is anyone else's perception too? Or do the benefits outweigh the potential social costs? :)