Facebook rides mobile wave to boost profits, user base

Facebook said Wednesday surging mobile advertising lifted its profits and revenues as the world's biggest social network grew to over 1.5 billion people. "This was another good quarter and we continue to grow the size and engagement of our community," said chief executive Mark Zuckerberg on a conference call. Facebook said the number of monthly active users of the network hit 1.55 billion, up 14 percent from a year earlier.