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Among other stocks making big moves:

• Facebook fell 83 cents to $21.11, a loss of nearly 4 percent. Facebook employees became eligible this week to sell restricted stock for the first time. Up to 1.5 billion more shares could be sold, about 3.5 times the 421 million shares that had been trading since Facebook’s initial public offering in May.

• General Motors jumped $2.22 to $25.50 after the company reported a turnaround in its South American business and gave a brighter outlook for sales in Europe. GM posted better-than-expected results internationally outside of China

• Apple fell $8.68 to $595.32. The Wall Street Journal reported that the head of Apple’s iPhone software development was asked to resign after he refused to sign a letter apologizing for the flaws of Apple’s mapping application.