By Anora Mahmudova and Barbara Kollmeyer, MarketWatch

Twitter, Garmin jump; Fed due later

NEW YORK (MarketWatch) -- The U.S. stock market opened higher on Wednesday, after the government reported the economy grew much faster in the second quarter than Wall Street had expected.

Tech stocks were shining amid a buying frenzy in Twitter Inc. (TWTR) after the social media network's results blew past analysts' forecasts. The Nasdaq Composite (RIXF) rose 29 points, or 0.6%, to 4,470.97 at the open.

The S&P 500 (SPX) opened 8 points, or 0.4%, higher at 1,977.72. The Dow Jones Industrial Average (DJI) gained 64 points, or 0.4%, to 16,976.44.

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The U.S. economy grew at a 4% annual pace in the second quarter, expanding at the fasts pace since last fall. Inflation as measured by the Federal Reserve's preferred price index surged in the second quarter to the highest annual rate in three years, potentially making the central's bank effort at managing the U.S. recovery more difficult.

Separately, the 218,000 jobs added by the private sector in July fell short of Wall Street expectations. Still, it was the fourth straight month in which that part of the economy has added more than 200,000 jobs.

Investors also remain focused on the outcome of the Federal Reserve's meeting and the policy statement due at 2 p.m. Eastern Time. Economists expect the central bank to reduce the monthly pace of its bond purchases by another $10 billion to $25 billion, and to signal that it intends to end quantitative easing in October. Investors will be looking for any hint that the first interest-rate hike from the Fed could come sooner than expected or that rates could go up faster than anticipated.

Also read: This tweak from the Fed could rock the market

Twitter rules

Shares of Twitter leapt 25% as analysts moved up price targets in the wake of blowout results. "Stronger results amid a negative sentiment should propel the stock higher," said Cantor Fitzgerald analyst Youssef Squali in a note to investors. He lifted his price target to $58 from $40. Read: Can Twitter convert the 'logged-out'?

Garmin (GRMN)sharply raised its forecast for the year, with the GPS -devices maker citing strong first-quarter results as reason for the improved outlook. Shares gained 7.4% ahead of the bell.

Humana(HUM) shares rose nearly 2%. The health care insurer's profit fell slightly short of expectations, but sales beat forecasts. The company also confirmed its 2014 per-share guidance.

Shares of Sprint (S) rose 2.4% ahead of the open after the mobile-phone company swung to a profit in the second quarter, as the pace of subscriber losses slowed.

Amgen(AMGN) shares rose 4.8% after the company posted a 23% rise in earnings, and announced a 15% cut in its workforce as part of a restructuring program late Tuesday.

DreamWorks Animation SKG Inc. shares (DWA) fell 14% after the movie studio swung to a second-quarter loss. (Read more about the day's notable movers here: http://www.marketwatch.com/story/twitter-amex-yelp-among-stocks-to-watch-2014-07-29.)

Spain stocks rise, Russian blue-chip index surges

European stocks traded mostly lower, outside of gains in Spain after surprising economic growth data. In Asia, Hong Kong stocks rose for a seventh straight session.

The Russia MICEX index of blue-chips surged more than 2% on Wednesday, which one analyst said is because the new sanctions don't affect the country's key gas sector. Some strategists maintain, though, that Russia stocks remain a tricky bet in wake of those sanctions.

In other markets, crude-oil prices (CLU4) rose, gold (GCQ4) gave up gains and fell after the strong GDP data. The dollar index (DXY), which measures the greenback against a basket of six currencies, traded slightly higher.

Also read: Need to know: Ditch your 'portfolio patriotism' ahead of dog days of August

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