(Telecompaper) Facebook reported second-quarter revenues up 39 percent year-on-year to USD 4.04 billion, while profits fell due to a sharp rise in costs and provisions for taxes. Operating profit dropped 8 percent to USD 1.27 billion, after an 82 percent increase in operating costs, and net profit was down 9 percent to USD 719 million, including a provision of USD 554 million for taxes. Adjusted EPS was still up 16 percent to USD 0.50. Revenues continued to benefit from the company's expanding mobile customer base, with mobile now making up 76 percent of advertising revenue 62 percent a year ago. Monthly active users on mobile reached 1.31 billion in the quarter, up 23 percent year-on-year, compared to total monthly users of the social network of 1.49 billion, up 13 percent. On a daily basis, 968 million used the social network, including 844 million over mobile, up 24 percent from a year ago. Facebook finished the quarter with USD 14.1 billion in cash, after free cash flow of USD 1.33 billion.