That bubble's gonna burst, and it's gonna fluff up a lot of people's livelihoods. It has nothing to sell. It produces NOTHING. Its inventory is people's data, that they're using to sell "personalized" ads to people...which still can't possibly compete with Google, who btw is innovating and financing new projects in an attempt to diversify their revenue streams.
If people stop logging into facebook and move to a new, more trendy upstart social network then they're fluffed. As soon as the masses can find a better alternative they will move on. Google+ however, won't be the one to do it. That thing sucks ass.
Apple is worth 5x the valuation of FB. Microsoft is worth 2.5 FBs. They both make real products that people buy and as a result employ thousands of people across the world (China mostly but yeah). Apple has 100B in cash and makes tens of billions in profit per year and yet they expect us to believe that FB is worth 1/5th the market value of Apple while selling nothing but ads and that inane gaming currency that barely anyone uses? At their peak, FB barely even made $1B in profit for an entire year (2011). Apple and Microsoft made 5-6x that in a single Quarter.
Source on the value of tech companies:
http://www.businessinsider.com/...ow-worth-more-than-2012-5