18 Most Popular Social Media Apps in 2017: Should Facebook Worry?

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3. WhatsApp

Monthly Active Users: 1.3 billion

WhatsApp has grown a lot over the years, but it is by far the most popular instant messaging app in the world. It has grown rapidly after it introduced end-to-end encryption, allowing users to have privacy by default.

Pixabay/Public Domain

Pixabay/Public Domain

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