LinkedIn IPO Is Biggest Since Google's--But Is It Too Big?

LinkedIn shares, under the symbol LNKD, increased 84 percent when trading started Thursday morning on the New York Stock Exchange, debuting at $83 a share and hitting $90 a share. That places LinkedIn's value at around $7.5 billion. According to ReadWriteWeb, the price of LinkedIn shares reached $122.70, then dropped slightly--as of 2:49PM ET, they were trading at around $104.42. Previously derided as a "Facebook for losers," LinkedIn's sky-high valuation suggests founder Reid Hoffman--now reportedly worth over $800 million--may be having the last laugh. At the same time however, it raises questions about the sustainability of these web businesses, and whether the bubble could burst.