No. It's 1999 all over again and IMO, the current valuation ($85BN on ±2.5B shares) is insane.
Can anyone honestly tell me they think FB is worth more than all other domestic advertising spent last year?

And what's the honest-to-god conversion rate for all those ad impressions, anyway? 5 percent?
AdWords manages twice that... because it's demand driven and focused by the viewer.