Facebook celebrates 6th anniversary, tops 400 million users, unveils redesign, and announces plans for e-mail

Now that’s a week. On Thursday, Facebook began rolling out a homepage redesign that focuses on the top menu and left column. Also on Thursday, the social network celebrated its sixth birthday and said that it has reached 400 million members. And, in what might be the biggest Facebook news, the company revealed Project Titan, as it’s called internally, which is a full Webmail service that will support all e-mail client and give its 350 million users their own Facebook e-mail address to use out…