Use the following list, which shows the 10 social media apps in the United States with the most monthly mobile users, in millions, in July 2018. Let the 10 social media apps in the list represent the universal set.

{x Ι x is a social media app with at least 100 million mobile users}

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Number of Monthly Mobile Users (in millions) Social Media App Facebook 169 Instagram 117 Facebook Messenger 111 Twitter 70 Pinterest 58 Snapchat 52 Reddit 33 Tumblr 23 WhatsApp 21 Google Hangouts 15