Mark Zuckerberg revealed “Project Titan,” the codename for an overhauled version of the company’s messaging product. Long in need of an upgrade, Facebook has finally given it a facelift and a ton of new features. Its central thesis is that messaging should be simple and unified, which is why it integrates IM, chat, SMS and e-mail into one inbox. Users can send e-mails from an @facebook.com address and text their friends from the same interface.