Those who are already comfortable using voicemail. Those who can pick back-up easily in relationships even when there have been long time gaps between contacts. Someone who can imagine themselves using and getting a kick out of receiving emoticons, symbols and acronyms that lighten up and facilitate communicating by e-mail. People who write in the same way they speak. People who like to be in touch with some degree of consistency.
Frequency is optional.
Almost anyone willing can learn to cybernetwork. CyberNetworking is a whole philosophy of doing business. They are free with their advice and post answers to questions that others ask on mail-lists, newsgroups, message boards and chat forums. They do this in such a way that it doesn't feel like an overt sales pitch to those who read their comments. They have an open mind and see possibilities that others don't or can't.