There are still plenty of issues to address, I have not shown all the variations of Facebook while browsing, tabs, or friends or other parts. However, I hope you find this exploration illuminating both for Facebook and from a user-centered design process. There is no reason for Facebook to be so confusing. I often am clicking between the HOME and PROFILE and FACEBOOK buttons searching for some link or function. And I do it several times a day. I imagine you do as well.
I am convinced Facebook can do better. Here are some ideas to get started.
Thanks for your interested, and I welcome your comments and ideas. And if you're from Facebook Corporate, sure, I AM available for consulting. (grin)