2.5 Billion People Use At Least One Facebook App
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If we talk about the number of users then Facebook and its suite of apps have it in large numbers. The actual FB app has 2.23 billion users per month, WhatsApp has 1.5 billion users, FB messenger app has 1.3 billion users and Instagram has 1 billion users. Do keep in mind that these users could be the same, as many people use all the 4 apps. Mark Zuckerberg said that at least 2.5 billion people at least use on key FB app.