The LinkedIn IPO has given rise to nostalgic talk of the heady days of the dotcom boom. There was a day when a 175 percent first-day pop was not out of the ordinary.

At a minimum, the LinkedIn deal has many peering into the pipeline. It's where social media giants like FaceBook, Twitter, Groupon and Zynga are waiting. Yandex, Russia's largest online search engine, will go public next week on Nasdaq. There's a lot of retail excitement right now, that's for sure, as retail brokerages reported heavy trading volume in LinkedIn.

But the memories of the dotcom bust are as powerful as the boom. And you can sense there's more skepticism this time around. In that vein, here's a bearish take on Groupon.

You can't really count on the LinkedIn stock to continue to soar unless it follows the pattern of Google and follows up the offering with a string of massive earnings upside surprises that pushes the stock into the stratosphere. That will be hard to do.

And the Financial Times suggests that the good times over LinkedIn could change as soon as next Tuesday, when restrictions on short selling the stock lift.

"Already brokers are advising hedge and quant fund clients to go short the stock based on its lofty valuation. Whether that deflates LinkedIn's price remains to be seen. But for now, exuberance is back, with more tech IPO 'pops' to come."

For more:
- here's the article

Related Articles:
LinkedIn IPO resembles credit bubble more than dotcom bubble   
JPMorgan creates a social media fund