By Rex Crum, MarketWatch

SAN FRANCISCO (MarketWatch) -- Tech stocks got off to a mild start Tuesday, with Amazon.com Inc. among the gainers following a report that the company is working on a challenge to Google's popular advertising platform.

Amazon (AMZN) shares rose 1%, to $336.85, after the Wall Street Journal reported that the company is looking at ways to appeal to advertisers, including developing software that could rival Google's AdWords.

TiVo Inc. (TIVO) was up by 1% at $13.72 a share. The digital-video recording technology company is set to report its second-quarter earnings results after the close of trading, with investors surveyed by FactSet expecting the company to earn 7 cents a share on $108.4 million in revenue.

Hewlett-Packard Co. (HPQ) rose 2% to $37.93, and other gains came from eBay Inc. (EBAY), Microsoft Corp. (MSFT) and LinkedIn Corp. (LNKD).

The tech-heavy Nasdaq Composite Index (RIXF) rose almost 11 points to 4,568 and the Philadelphia Semiconductor Index (SOX) edged into positive territory. (Read more about other market actvity in Movers & Shakers http://www.marketwatch.com/storyno-meta-for-guid.).

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