Facebook Inc posted surprisingly strong profit and revenue growth as the world’s largest social network grew even larger, with a spike in mobile users and advertising that lifted its stock to an all-time high. The company on Wednesday reported audience numbers that suggest it is poised to take on mainstream media as an advertising force, helping investors to overlook Facebook’s huge spending on hiring and building data centers. Facebook now has 8 billion video views per day from 500 million people, compared with 4 billion views in April.