Facebook reports strong Q4 as mobile ad sales keep growing

Facebook continues to reap big rewards from ads placed on people’s smartphones, which now generate more than two-thirds of its revenue.Roughly 69 percent of Facebook’s revenue for the quarter ended Dec. 31 came from mobile advertising, the company said Wednesday.Total revenue for the quarter was $3.85 billion. That was up 49 percent from a year earlier and beat the consensus estimate of $3.77 billion from analysts polled by Thomson Reuters.A year ago, mobile ads accounted for just over a