Really? It bankrupts its users? People can't hold a job because of it? People will rob stores to get more money to use more social media? It causes families to painfully detach themselves from addicts?
Those behaviors aren't limited to substance addiction--perhaps most well known is gambling addiction.
It's no secret that technology companies (especially social media companies) spend billions coming up with ways to keep users on their apps/services. Engagement is a palatable way to measure addiction.
