NEW YORK ( TheStreet -- Just In case you hadn't heard, Facebook is planning an IPO. Not just an ordinary launch, but an offering to beat all offerings. The social network giant hopes (and probably will) to raise $10.6 billion. That should spark a huge run on IPOs, right? Not necessarily. In fact, there's a good chance it may make the rest of the IPO candidates out there now pale by comparison and a few reticent to launch at all. According to Renaissance Capital, 18 companies have already withdrawn plans to go public in 2012, as of May 9. That compares to 16 in all of 2011 and 10 in 2010. The most common reason cited is "market conditions," which rings false with stocks turning in one of the best first quarters in years. The actual reason: Nobody wanted to buy the stock at the price the companies wanted to sell it. Market conditions sounds so much nicer than no one likes us. Other offerings were probably hoping that some of the Facebook hype would rub off on their IPOs. But hype is no guarantee of great stock performance beyond maybe the first day. The average first day pop for new stocks is 16% this year, as stated by Renaissance Capital. This is dwarfed by the dot-com bubble first day average of 56% in 2000 and 72% in 1999, but it is the highest average in 12 years and we're not even half way through the year. Unfortunately, mostly institutional investors get to enjoy those pops. The majority of regular investors have to buy in the aftermarket and then the performance is not as good as the hype. 10 Stocks to 'Like' When Facebook Goes Public >>Groupon ( GRPN) is the best example. The hysteria on the floor of the exchange that day was shocking. The company executives refused most interview requests and acted like the equivalent of financial rock stars. Groupon is now down 60% after facing questions about its accounting and profits. My guess is their schedule is opening up for interviews. Remember America Online, now known simply as AOL ( AOL)? They went public in 1992 priced at $11.50 per share and popped 28.3% the first day to close at $14.75. The company bragged of 30 million subscribers. That pales in comparison to Facebook's 900 million users, but this was also in the time of Apple II and before smart phones. The company went on to merge with Time Warner ( TWX), and the market cap hit $226 billion in 2001, but now, what's left of the company has a market cap of around $2.2 billion.