By Rex Crum, MarketWatch

SAN FRANCISCO (MarketWatch) -- Leading tech stocks such as Apple Inc. and Amazon.com Inc. rose in early trading Thursday, and the overall sector got a boost from a bigger-than-expected revision to U.S. second-quarter growth.

The nation's gross domestic product rose by an annual rate of 2.5% during the period between April and June, beating the government's first reading as well as economists' revised expectations.

Among bellwether tech stocks, Amazon (AMZN) rose 1% to $284.27. The online retailer said Thursday it has opened a Kindle book store in Mexico, with more than 70,000 Spanish-language titles available.

Apple (AAPL) rose almost 1%, to $495.17, Facebook Inc. (FB) was up by more than 2%, at $41.47 a share, Microsoft Corp. (MSFT) shares edged up by 22 cents, to $33.24 and Google Inc. (GOOG) rose by 1%, to $858 a share.

Google was also getting attention in a different way, amid reports that company co-founder Sergey Brin and his wife, Anne Wojcicki, have separated after six years of marriage.

Salesforce.com Inc. (CRM) moved into positive territory, rising by 9 cents a share to $42.86 ahead of the subscription business-software company's quarterly results, due after the close of trading.

Chipmaker Altera Corp. (ALTR) rose 2%, to $35.53 a share. Late Wednesday, Altera's board of directors authorized adding another 30 million shares to the company's stock buyback plan.

The Nasdaq Composite Index (RIXF) gained 36 points, or 1%, to 3,629. The Philadelphia Semiconductor Index (SOX) was up by 1.4%.

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