Thanks for asking!

I'm using the word addiction for myself, but perhaps I should qualify it as a minor addiction, not a full-on addiction. I find that for me, I have an inclination to compulsively dive into these things, even when doing so is not the healthiest choice for me (causing lack of sleep, isolating rather than being social, less focus on work or dealing directly with life's challenges and the feelings that come up when feeling overwhelmed or pressured by life's challenges).

I'm not trying to belittle the severity of substance addictions such as to nicotine or drugs. Internet addiction is a real phenomenon.

I found this definition here: http://netaddiction.com/faqs/
Internet addiction is defined as any online-related, compulsive behavior which interferes with normal living and causes severe stress on family, friends, loved ones, and one’s work environment. Internet addiction has been called Internet dependency and Internet compulsivity. By any name, it is a compulsive behavior that completely dominates the addict’s life. Internet addicts make the Internet a priority more important than family, friends, and work. The Internet becomes the organizing principle of addicts’ lives.

Of course, just like having a beer does not mean you are an alcoholic, enjoying the internet or social media does not mean you have an addiction to the internet or social media.