(Telecompaper) Facebook reported a slowdown in growth in the second quarter and said it expects the trend to continue in the rest of 2018. Revenues rose 42 percent year-on-year to USD 13.23 billion, compared to annual growth of 49 and 47 percent in the previous two quarters. The operating margin fell to 44 percent from 47 percent a year ago, while net profit was still up 31 percent to USD 5.11 billion or USD 1.07 per share.