In addition to making it simple to import Facebook email addresses; Yahoo! rolled out an “auto-updating” Address Book! for Yahoo! Contacts. If you share your personal information with friends, next time you change details, Yahoo Contacts will automatically update the info you shared with them previously. The same thing happens with your friends’ details on your Address Book but only if they opted to share their Yahoo Contact Details’ auto-updating features with their contacts including you. To set up, go to Yahoo! Contacts and click “Share my info” link under Popular Tools. Clicking this link'll display your contact info. Then click Start Sharing, Yahoo Contacts will then notify your friends & business contacts that you’ve changed info, and automatically gets update in their address book.