Some Facebook employee wrote a rebuttal on Facebook to Facebook is the new AOL:
my former PayPal colleague Yishan Wong, now an ass-kicking, name-taking engineer at Facebook, lays the "Walled Garden" rebuttal smackdown on Kottke, Arrington, et al. you go, Yishan... you just go.
And then. Oh, the irony:
Doh! guess Yishan's post is only visible to his facebook friends... okay, so maybe semi-permeable garden, perhaps.
Mmmm, invisible smackdown.