Exclusive Look Inside the New Facebook HQ: You'll Like This [PICS]

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It's been a little more than a year since Facebook bought a 57-acre campus on the outskirts of Menlo Park in Silicon Valley, and started the slow process of turning it into its headquarters of the future.

Well, the future is now. As of last week, every last Facebook staffer has been moved into the Menlo Park facility, which is almost unrecognizable compared to the way it looked a year ago.

Mashable checked in on the new Facebook HQ in December, but there's been a lot going on since then. The entire campus has a fresh coat of paint -- not to mention fresh graffiti-style spray painted and stenciled artwork everywhere. (Employees are encouraged to "hack their space.")

We got an unprecedented behind-the-scenes look at what makes Facebook tick -- the high-tech booking systems, amusingly-named conference rooms, and premium caffeination facilities.

(What really makes Facebook so eager to constantly upgrade itself? Two words: Philz Coffee.)

We saw plenty of things that make working at the social network so much fun -- including a wall where Jeremy Lin had marked his height, towering above the rest of the staff.