WhatsApp founder Jan Koum just announced that the hugely popular messaging company has launched a web client that'll let users fire off messages from inside the desktop version of Google Chrome. As Koum points out, WhatsApp for the web is only an extension of the mobile apps you're already familiar with, meaning all of your lengthy conversations and exchanges still live primarily on your phone.
WhatsApp Web requires that you install and run the latest version of the mobile app on your phone, and it just might not be available for everyone yet. The (characteristically simple) setup process requires you to scan a QR code from the mobile app of your choosing from this site (WhatsappWeb). And you are all set to use WhatsApp on the web.