12 best tweets of the week, including a panda, David Crosby, and an egg

It's Friday. Seriously. Finally. I double-checked because, well, you know, who could be totally sure these days? 

And here at Mashable we're going to keep doing what we've been doing on Fridays for quite some time now: collecting the best tweets of the week. Why? Because it's the end of the week, we've all got to keep...