NEW YORK (TheStreet) -- There's been a hint of IPO mania happening during the past year, and while it's nice to see new companies coming to the market, there have not been many names that have captured the interest of this value investor.What has been interesting is the proliferation of companies coming to market that offer free services and generate revenue through advertising. These businesses often ask consumers to pay up for a premium version of their services. I use many of these services personally -- the free versions, that is. I won't pay up for bells and whistles. It's a classic case of "use the products, but don't buy the stock." Some of these initial public offerings have come amid much fanfare, with the granddaddy of them all happening Friday, when Facebook ( FB) begins trading. Let's first look at the stocks of other recent IPOs. 10 Stocks to 'Like' When Facebook Goes Public >> LinkedIn ( LNKD), which operates a useful online professional network, went public at $45 a share last May. One year later, the shares have risen 250%, and many would call this IPO a great success. The company is profitable, but trades at more than 750 times trailing earnings and 18.5 times revenue. Using 2013 analyst estimates, the company trades for 89 times what it's expected to earn, and 8.5 times its forecast revenue. That's far from cheap. While it's a far cry from the tech-bubble IPOs of the late 1990s, when some companies had no revenue, it still harkens back to that time. I've used LinkedIn for several years -- the free version, that is. I love the product, but won't pay for it, and I won't buy the stock either. Pandora Media ( P) came public at $16 a share last June. Nearly one year later, the shares are trading for about $10, down 60%. This Internet radio company's product is outstanding, and I use it on a daily basis -- the free version, that is. I don't mind hearing a few commercials in lieu of paying up. Pandora is not profitable on a trailing 12-month basis, and sells for about six times its sales.
Analysts don't expect the company to be profitable on an annual basis until 2014, when the average earnings forecast is 4 cents per share. That puts the forward price-to-earnings ratio at 250. Once again, I love the product, but not the stock. I feel the same about Groupon ( GRPN), which came public in November at $20 and fell to $10 recently. While the company reported its first quarterly profit yesterday and a solid revenue increase, driving shares to around $15, I remain skeptical of its long-term prospects. I may be among the few that are not excited about the upcoming Facebook initial public offering. All the hoopla surrounding what might be the largest IPO of all time drives me crazy. But I am a value investor, so you might expect that. The bottom line is that I don't understand the math. I don't see how Facebook is worth $100 billion, which is more than McDonald's ( MCD), on par with PepsiCo ( PEP), and about half of Berkshire Hathaway's ( BRK.B) value. In Search of the Next Berkshire Hathaway >> I've grown a bit weary of Facebook. I use it occasionally, but the novelty has worn off, and I wonder whether that sentiment will ultimately ring true for others. I understand that there are hundreds of millions of users, and it's a real business that's generating significant revenue -- $3.7 billion in 2011 -- and net income of $1 billion, but I simply can't get to a value of $100 billion. The common thread with all the IPOs I've mentioned is that each of the companies offers useful products or services, but there's a disconnect between their utility and the valuation of these companies. That's not uncommon. IPOs often generate investor interest that drives prices far higher than the company's true value. Sometimes it takes a while for the dust to settle. Along the way, money will be made and lost, but I won't be participating. Among all of the IPOs of the past year, those that interest me include Spirit Airlines ( SAVE), which went public in May 2011 at $12. As a profitable airline, Spirit is a rarity. I'm also intrigued by Midwest supermarket chain Roundy's ( RNDY), which debuted in February at $8.50. I'm also keeping an eye on Dunkin Donuts ( DNKN) (July IPO at $19), which is expensive at current levels but remains a great business. -- Written by Jonathan Heller, president of KEJ Financial Advisors and a contributor to TheStreet and Real Money. As of publication, he had no positions in the stocks mentioned.