Mark Zuckerberg

Mark Zuckerberg
Facebook’s CEO Mark Zuckerberg interacts with technology students in a town hall-style meeting in New Delhi, India, Wednesday, Oct. 28, 2015. Zuckerberg is his second visit to India this year alone. (Shirish Shete/Press Trust of India via AP)Photograph by Shirish Shete — AP
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It’s hard to overstate Facebook’s dominance on the social web. Its namesake product has 1.5 billion monthly users; its subsidiaries WhatsApp, Messenger, and Instagram reach a respective 900 million, 700 million, and 400 million people each month. Remember how people once scoffed at Facebook’s chances of turning a profit? It’s safe to say Zuckerberg has answered that challenge: Facebook had $2.9 billion in earnings in 2014. The company accounts for one of every five minutes Americans spend on mobile phones, a fact not lost on the advertisers plowing increasingly large sums into its highly targeted ad products. The result? Operating margins exceeding 25% and year-over-year revenue growth above 40%.