I was wondering this too after reading the "call to action" -- do I get to keep my data plan? (Did the author keep his?) I assume the answer is supposed to be no, but that might be good to note explicitly as this wouldn't be nearly as life-changing if taken a little too literally. (Not to be too nitpicky -- the article makes great points!)
My general heuristic is that anything with an infinite feed is designed to suck you in—so avoid apps that provide them, as much as is feasible for your lifestyle.