Answer
Answers may vary
Modeling Facebook's active user count can provide the company with an estimate for future user count.
Work Step by Step
Data from: https://www.statista.com/statistics/264810/number-of-monthly-active-facebook-users-worldwide/
$y=213.22x+222.69$ measures the number of active users for Facebook (where $x$ is the number of years since 2009).