Through the years, you've probably accumulated a laundry list of "friends" from different stages of your life. Some "friends" you keep around because you want to see what they're up to, others you want to keep in regular contact with and the rest you're just too lazy to "unfriend." (Why do they make that so hard to do?)
We might wonder how it came to be that we started meeting psychiatric diagnostic criteria for addiction, not for heroin or alcohol, but for a social media site. It can't possibly be the "like" function that makes us irritable and anxious when we can't check our feed. So to what, exactly, are we addicted?