In many ways, the monthly active user count is the most important number in tech. It’s a key performance indicator that helps determine the general popularity of a given network, along with being used to help determine value. Here’s a look at the monthly active user (MAU) count for seven of the major social networks.

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1. Facebook: 1.59 billion (December, 2015)
2. Instagram: 400 million (September, 2015)
3. Twitter: 320 million (March, 2016)
4. Google+: 300 million (October, 2013)
5. LinkedIn: 100 million (October, 2015)
6. Pinterest: 100 million (September 2015)
7. Snapchat: Unknown