The web 2.0 conference coined a term Addressbook 2.0. The basis is that if we had an addressbook integrated across all communication tools and social network platofrms that we were members of, then we can be contacted by friends using email, phone, IM or social "nudging" or "poking" depending on where we were.

I love this. I was looking at my addressbook which is synchronized by Plaxo and found several outdated contacts and many outdated email addresses. I wish I had a way to run this through a program that told me some of these addresses do not exist and Palxo charges me for removing duplicates from my addressbook.

More power to AddressBook 2.0 http://radar.oreilly.com/archives/2007/02/social_network_1.html#commentsemr