Remember when all the Internet companies went IPO crazy, and the stock market knew no bounds as they lavished affection on said companies? Then the bubble burst, former Wall Street darlings were now paupers, and the stock market spiraled out of control.

Why do I feel like we may be heading that way again?

Yesterday I mentioned that Facebook is now valued at $15 billion. Why it’s value is that high is anyone’s guess, but I think it has gotten to a point where people go “Oh, well they say it’s worth that much so it must be.”

According to Mashable, LinkedIn is pondering an IPO. They’re in a different position though with the fact they actually sell subscriptions for the bigger levels of service and don’t rely solely on advertising.

Still, all this talk of valuations and IPOs tends to make someone who watched the first tech bubble burst be just a tad bit nervous for fear we’re heading that way again. These sites to be mare valuable to your daily life this time around, it would be a shame to lose them.