Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.
What: Shares of freshly public social network Facebook
So what: After the IPO priced at $38, shares had popped upward of 18% within the first minute of trading. Today, shares have touched as low as $33, or 13% below the offer price -- and on a broad-market rally day, no less. There's no shortage of well-deserved skepticism over Facebook's lofty valuation, and it seems the IPO glow is fading quickly.
Now what: Other social-media stocks are also falling in lockstep with Facebook's plunge, including social gamer Zynga
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