(Telecompaper) Facebook reported revenues up 38 percent to USD 1.46 billion in the first quarter, compared to USD 1.06 billion in the first quarter of 2012. The surge was driven by advertising sales up 43 percent to USD 1.25 billion. Mobile advertising revenues accounted for around 30 percent of all ad revenues. Daily active users rose by 26 percent in one year to 665 million, on average, for March 2013. Facebook's income from operations fell by 2 percent to USD 373 million on a GAAP basis. First quarter costs and expenses were USD 1.08 billion, an increase of 60 percent from the first quarter of 2012, driven primarily by infrastructure expenses and increased headcount. Capex decreased by 28 percent to USD 327 million. Net profit increased by 7 percent to USD 219 million from USD 205 million in the first quarter of 2012, leaving diluted EPS unchanged at USD 0.09.