Wall Street stocks have opened higher following a surprisingly strong report on second-quarter US growth and an earnings report from Twitter that sent the social network's shares soaring.
Five minutes into trade, the Dow Jones Industrial Average gained 61.11 points (0.36 per cent) to 16,973.22.
The broad-based S&P 500 rose 7.91 (0.40 per cent) to 1,977.86, while the tech-rich Nasdaq Composite Index jumped 28.29 (0.64 per cent) to 4,470.99.
The Commerce Department said US economic growth came in at 4.0 per cent in the second quarter on the back of strong private investment and consumer spending.
Commerce also said the economy's first quarter slowdown was not as bad as previously thought, reducing the estimated contraction from 2.9 per cent to 2.1 per cent.
In a separate report, payrolls company ADP said the US economy added 218,000 private-sector jobs in July, slightly above the 215,000 analyst estimate.
Markets are waiting for a policy decision from the US Federal Reserve at 1400 GMT. The US central bank is expected to continue to trim its bond-buying program and stick to its interest rate outlook.
Twitter bolted 21.3 per cent higher after revenues more than doubled from a year ago to $US312 million ($A338 million) in the three months that ended June 30, with the number of monthly active users hitting 271 million, up 24 per cent year-over-year.
Twitter still reported a $US145 million loss, but analysts said the report restored confidence in the company's growth potential.
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