Today, Yahoo! announced the release of the Address Book API which enables developers to interface directly with one of the largest “collection of address books” on the web. This is an incredible release moving forward the opening of the social web. So what can you do with this new API? “Once a user authorizes your application, youÃ¢â‚¬â„¢ll be able to easily access that userÃ¢â‚¬â„¢s address book and look for specific contacts.”
If you think of this in relation to a Facebook application, it is similar to having the ability to browse through who a person’s friends are and directly contact those friends.