(AP) — Facebook was supposed to soar. Instead, it plunged.

After the social network’s stock fizzled on Friday in its long-awaited debut, its stock fell 11 percent on Monday, even as the rest of the stock market rallied.

The downward spiral has left some people sitting on big losses, and others scratching their heads. After all, nothing fundamental has changed at Facebook in the days since the much-hyped company came to the stock market – Facebook still has more than 900 million users, its 28-year-old founder Mark Zuckerberg controls the company, and it is still one of the few profitable Internet companies to go public.

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