Optweetmum

Definition:A person on Twitter with just the right amount of twitter activity.  Some people have twitter accounts they rarely use (what, why are you looking at me?) so it's hardly worth following them.  On the other hand, people who are too involved in Twitter are hard to follow for a couple of reasons: they tweet everything they do and clog your twitter feed, or they spend most of their time communicating with other twitterers, and their tweets are unintelligible sequences of twitter handles, hash tags, initials, and fragments of conversations you're not involved in.  But a person who is Optweetmum posts regularly, but still types in complete sentences, and understands that e-mail may not be cool, but it's still better for private conversations.