FacebookFacebook reported 39 percent 2Q revenue growth to $4B on a 9.1 dip in net income to $719M.

Profit slid because the company spent heavily to add workers. The Menlo Park, Calif-based social networking operation increased employment 52 percent to 10,955 from the 2014 quarter.

CEO Mark Zuckerberg called the financial results "another strong quarter for our community" as "engagement across our family of apps keeps growing."

He expects newer businesses such as Messenger and WhatsApp will soon make money, but asked investors for patience to allow the company to develop them correctly.

Facebook registered a 43 percent rise in advertising growth to $3.8B. Mobile advertising generated 76 percent of total ad revenues, up from 62 percent in last year's quarter.

The company said an average 968M people checked into Facebook during the quarter, up 17 percent from last year.
Monthly active users rose 13 percent to 1.5B.