By Rex Crum, MarketWatch

SAN FRANCISCO (MarketWatch) -- Tech stocks put in a mixed performance Tuesday as investors awaited the second-quarter quarterly results from social-media company Twitter Inc., due after the close of trading.

Twitter (TWTR) shares rose 1.7% to close at $38.2 as analysts surveyed by FactSet have forecast the company to reports a loss of a penny a share on $283.4 million in revenue for the quarter ended in June. During the year-ago period, Twitter lost 12 cents a share on sales of $139.3 million. The company is under pressure due to concerns about slowing growth of its user base. Its share price has fallen 40% this year.

With Twitter under the microscope, gains came from other Internet stocks such as Priceline.com Inc. (PCLN), eBay Inc. (EBAY) and Pandora Media Inc. (P).

Synchronoss Technologies Inc. (SNCR), which provides software that activates and connects mobile devices and communications networks, surged by more than 14% to close at $39.72. Before the market opened Tuesday, Synchronoss reported better-than-expected second-quarter results.

Online real-estate information company Zillow Inc. (ZILLOW.XX) fell 6.5% to $149.87 one day after it said it would acquire rival Trulia Inc. (TRLA) for $3.5 billion in stock. Trulia's shares also fell by 4.4%, to $62.20.

Among tech bellwethers, declines came from Microsoft Corp. (MSFT), Apple Inc. (AAPL), Facebook Inc. (FB) and Netflix Inc. (NFLX).

The tech-heavy Nasdaq Composite Index (RIXF) rose gave up its gains to shed 2 points and close at 4,442, while the Philadelphia Semiconductor Index (SOX) closed with a small loss.

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