The important thing about all these different services is how you decide to include people. It's more of a real organic social network where some casual friends

The important thing about all these different services is how you decide to include people. It's more of a real organic social network where some casual friends might be Facebook worthy but have no reason to ever e-mail me personally. Others might not be personal contacts but are interesting enough to warrant a Twitter follow. Some business contacts are people I wouldn't mind IM-ing me outside of work -- others goto a separate IM account I only login to during business hours. Some people have full access.