Plaxo

Perhaps the ultimate online address book, Plaxo is enhanced with the superpowers of a social network and plug-ins for many Web-based services like Flickr, YouTube, Twitter and LiveJournal for sharing across the Internet.

It is an online address book service founded by Napster.Plaxo provides automatic updating of contact information. Users and their contacts store their information on Plaxo's servers. When this information is edited by the user, the changes appear in the address books of all those who listed the account changer in their own books. Once contacts are stored in the central location, it is possible to list connections between contacts and access the address book from anywhere.

Homepage