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Facebook said its better than expected first quarter result was thanks to rapid growth in its mobile advertising business.
Revenue in the three months to March jumped 72 per cent to $US2.5 billion, versus analyst estimates of $US2.36 billion.
After costs, net profit came in at $US642 million.
Revenue from mobile ads made up 59 per cent of the total earnings compared with 30 per cent the same time a year ago.
Facebook's monthly active users grew to 1.28 billion by more