> okay it's not a slippery slope, but it's something similar (that's why I said "feels like"). He's trying to establish a continuum of things that have a variety of addictive properties in an attempt to discredit the whole idea of addiction ("Don't try to make your video game fun, or some people may become addicted")..

But he actually is correct. Use the same term to describe the effects of ingesting biologically active chemicals and the effects of emotionally engaging activity -- which in this case mostly consists of exposure to information -- absolutely is disingenuous equivocation. People in this very thread are comparing Instagram with ingestion of alcohol or tobacco products, and that absolutely is a prevarication.

It's not unreasonable to observe the course of these debates, and suspect that the people invoking the language of addiction are doing so as a pretext for treating what is actually a cultural issue instead as a medical one, so as to falsely appeal to empirical certainty to answer questions that actually demand normative debate.