It's an addiction that can be quit instantly with no ill effects using nothing more than the willpower it takes to turn down a second slice of cake. Unfortunately I can't imagine what sort of social service can teach all these progressively-more-coddled generations how to tap willpower.
One could certainly stop stop Facebook, WhatsApp, Twitter, Snapchat and so on. But you'd have to consider what the impact is; maybe you'll become more distant from friends and family. Maybe you'll miss out on events. These things are pretty important, for obvious reasons, and it's a shallow argument that everybody can simply walk away "instantly with no ill effects".
It's up to the individual to decide if the trade off is worth it. Clearly, for some, it is.
Both the "friends and family" and "events" arguments sound like something Facebook itself might say, in the course of its browbeating you with subtle fear-mongering. Take it from me, the impact might actually turn out to be much less than you think. In some cases (like mine), it's even a positive. For example, not going to every single "event" leaves more time for all sorts of productive activity. Not keeping up with what everybody else is doing, leaves more time for you to actually do something yourself. And a certain amount of distance from friends and (especially in my case) family is actually fucking GREAT.
I'm not arguing, just stating simple facts. I have quit many of these things and went back to phones for communication, which still works perfectly well. Do I miss out on things? Maybe. It doesn't harm me in the least.
I certainly made no proclamation as to how anyone should live, which you seem to have mistakenly inferred. I suspect that level of unprovoked defensiveness to have an interesting underlying cause.
It's pretty baffling. When you suggest that people try simply not using Facebook or WhatsApp they act as though you just suggested they stop eating and breathing.
It's because most of those suggestions try to imply that people can't quit Facebook, because they're stupid or addicted or something. One should stop and consider here that just because you can, doesn't mean you should. A lot of people, myself included, get actual value from using Facebook and thus don't have a reason to stop using it, even though they are perfectly able to.