Narcissistic people may use the access to a numerous relationships as a means to gain an admiring audience. Many theoretical approaches could be useful for studying how various personality types behave in cyberspace, but none could be more powerful or versatile than psychoanalytic theory. Cyberspace is a psychological extension of the individual's intrapsychic world. It is a space where text-only communication stimulates the processes of projection, acting out, and transference. Therefore, a theory that specializes in understanding the intrapsychic world and those processes is essential.
Psychoanalysis fits that bill perfectly.
Do manics impulsively launch off email without proofreading and later regret it. The Presentation of Self in Electronic Life - An article by Hugh Miller from Nottingham Trent University about how people use web pages as an expression of personal identity.