(Telecompaper) Facebook revenue for the second quarter 2013, ending 30 June 2013 increased 53 percent year-over-year to USD 1.81 billion from USD 1.18 billion. Advertising revenue represented 88 percent of total revenue and increased 61 percent to reach USD 1.60 billion. Mobile advertising revenue represented 41 percent in the quarter and revenue from payments and other fees increased 11 percent to USD 214 million. GAAP costs and expenses dropped 35 percent to USD 1.25 billion. Excluding share-based compensation and related payroll tax expenses, non-GAAP costs and expenses were USD 1.02 billion, up 52 percent from USD 669 million.