11/04/2011 05:52 pm ET Updated Jan 04, 2012

Facebook, Google, Living Social: Groupon Competitors That Could Take Over

Groupon is off to a hot start on the stock market, seeing its company value balloon to over $16 billion on its first day of trading on the NASDAQ exchange. But just ask Initial excitement over a stock offering does not guarantee a long and happy life for an Internet company.

With that in mind -- and with the oft-repeated caveat that Groupon is in a market with hundreds of competitors and extremely low barriers to entry -- we're taking a look at the companies that could take Groupon's valuation from over $16.5 billion down to zero point zero.