Think about it from the Wall Street point of view.
Morgan Stanley is an investment bank, one of if not the best in the world, and has been since it was spun off from JP Morgan in the 30's. Their job was to sell the stock to the public of probably the most widely used thing on the internet aside from Google search.
Did nobody take into account that the only way a company can get to rediculous P/E is to have phenomenal growth of PROFITS, not user base.
Think Amazon and Ebay, their P/E ratios have been nothing short of retarded, why? Gigantic amounts of sustainted growth. Facebook has no growth.
Facebook was priced at 100 times earnings. If you wanted to buy the company as a private enterprise you'd have to own the business as is for one hundred years to break even on the investment.
And it isn't like Facebook could start charging for membership, nobody would use it.
Given these facts I'd say Morgan Stanley did a hell of a job. The same way the salesman at the used car lot has you driving home in a gremlin, that you paid for as if it was a Cadillac, did a hell of a job.
GRPN made at least some money, same with Zynga.
Neither of those were priced at 100 P/E out of the gate either.
You have tens of thousands of of stocks to choose from, keep looking.