NASDAQ had to use a "circuit-breaker" to stop the bleeding.
Read more...Morgan Stanley was dropped two notches.
Read more...Nasdaq's trading glitch on Facebook's initial public offering is costing Wall Street firms millions.
Read more...Shareholders claimed that the social networking site didn't reveal a significant drop in revenue forecast.
Read more...The White House and Wall Street try to control the damage as the stock market reels.
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