Facebook Boasts a Quarter of the World Among Its Users

Facebook Inc. said Tuesday it has 2 billion users now, meaning roughly a quarter of the world is plugged into the social media platform. More users means more eyes on lucrative ads, although the company has warned ad growth could slow. Shares have surged 32 percent this year and still trade at a 2 percent discount to their one-year historical average price-to-earnings multiple.

— With assistance by Matt Turner

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