By Rex Crum, MarketWatch

Social-media company gets a mild lift, Rackspace falls on earnings results

SAN FRANCISCO (MarketWatch) -- Tech stocks put in a mixed early trading performance Tuesday, with Twitter Inc. on the rise and Rackspace Inc. losing ground after the cloud-hosting company's middling quarterly results.

Twitter (TWTR) was up 2% at $44.08. Late Monday, the social-media company said it a regulatory filing that 11% of its 271 million monthly active users used Twitter via third-party apps during the second quarter of the year. Twitter had earlier said that 14% of its users accessed Twitter through such apps.

Twitter also said "8.5% of all active users used third party applications that may have automatically contacted our servers for regular updates without any discernable additional user-initiated action." Or, nearly 23 million Twitter users are actually "bots" that are automated to send out information without really interacting with Twitter or its ads.

Mild gains also came from Apple Inc. (AAPL), Amazon.com Inc. (AMZN) and Microsoft Corp. (MSFT).

Rackspace (RAX) shares fell almost 7% to $29.09. On Monday, the provider of cloud-based hosting services reported second-quarter earnings that were essentially flat with a year ago, even as sales rose.

Losses also came from Facebook Inc. (FB), eBay Inc. (EBAY), Intel Corp. (INTC) and Hewlett-Packard Co. (HPQ) .

The tech-heavy Nasdaq Composite Index (RIXF) rose 7 points to 4,394 and the Philadelphia Semiconductor Index (SOX) was off 0.5%.

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