Does a narcissist tend to have close friends that are also narcissistic?

Mirroring problem. An extremely narcissistic person will not have friends who are truly "close, " as in real intimacy where people share who they really are. The person feels deep shame about, or does not know, his authentic self. They may collect people who will admire them, in order to feel whole. Two narcissists may inter-relate, but there will be inevitable conflict when one does not mirror the other as needed.
Narcissist. Generally, yes. The narcissist will only associate with those he feels are equally as special as himself (in other words, other narcissists.) These friendships are not long lived, and tend to end abruptly.