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LinkedIn's surging share price cooled Friday as the social network projected slower revenue growth next quarter following a decision to lower the number of display ads that the website shows.

As the search volume on generic terms such as "debt", "portfolio" and "stocks" fell, the Dow Jones average tended to go up - and vice versa. An investment strategy based on these search volume data between 2004 and 2011 would have made a profit of 326%.

For a few surreal minutes, a mere 12 words on Twitter caused the world's mightiest stock market to tremble. No sooner did hackers send a false Associated Press tweet reporting explosions at the White House on Tuesday than investors started dumping stocks - eventually unloading $134 billion worth. Turns out, some investors are not only gullible, they're impossibly fast stock traders.

Groupon lost more than a fifth of its value in early trading after reporting a quarterly loss late Wednesday that fueled criticism of the daily-deals site's aggressive growth strategy.

Google's stock price topped $800 for the first time Monday amid renewed confidence in the company's ability to reap steadily higher profits from its dominance of Internet search and prominence in the increasingly important mobile device market.

EBay Inc reported holiday quarter results that just beat Wall Street expectations, but the e-commerce company also gave a cautious forecast for 2013. EBay shares climbed 1.7 percent to $53.80 in after-hours trading following the announcement. Expectations were high ahead of the results because sales data from outside sources suggested strong sales growth from eBay's online marketplace and a solid increase in transactions processed by the company's PayPal payments business.

Facebook joins the Nasdaq-100 Index, a move accelerated by the departure of Infosys, which is moving to the New York Stock Exchange.

Google Inc.’s stock plunged suddenly on Thursday afternoon after a contractor released the search company’s third-quarter earnings report early, by mistake. The stock fell $68.19, or 9 percent, to $687.30 before trading was halted to give investors a chance to digest the news. Google’s report had been slated for release after the close of regular trading Thursday.

Facebook Inc.'s stock took a hit Monday after an article in the financial magazine Barron's said it is "still too pricey" despite a sharp decline since its initial public offering.

A federal judge Thursday temporarily blocked the government from enforcing a new insider trading law that would require about 28,000 executive branch employees to disclose details of their financial transactions on the Internet.