I disagree that things like NFLX and AMZN are not supported by fundamentals; the question is, though, at what level. FB and LNKD can shove it, though.
Everybody buys everything on AMZN now, and NFLX has tremendous upside, the only problem is will there be the content generation to support it. These two have actual monetized businesses that rely on more than website hits and impressions.