The World’s Oyster is an online Address Book that automatically updates itself. The way it works is that you and your friends register and connect with each other, and then each person updates their own contact information whenever it changes. So instead of receiving an email from your friend that says, “I’ve moved. Please update your address book,” you receive an email from The World’s Oyster that says, “JOE SMITH updated his entry in your address book,” and YOU don’t have to do anything. Your address book updates itself. The next time you want to make sure that you have Joe Smith’s most up-to-date contact information, all you have to do is sign in to The World’s Oyster and look it up in your address book.