Facebook shares dip from high as investors fret over costs, future profit

The world's biggest online social network is searching for new advertising features to supplement main revenue streams that it expects to cool off this year

Facebook reported surging quarterly profit and revenue on Wednesday, helped by its fast-growing mobile ad business. But its shares dipped from a record high in after-hours trading as investors showed some nervousness about future earnings.

The world's biggest online social network, which is nearing the five-year anniversary of its initial public offering, is searching for new types of advertising features to supplement its main revenue streams that it expects to cool off this year.