Millions of thematic groups have existed for many hundreds of years and they did not need Facebook to organize. People are experiencing inertia and are too lazy or naive to help themselves. And, yes, some are truly addicted.

This inertia and naivete is harmful and dangerous to everyone involved. It's like if they met in a sketchy part of town or were using tools unsafely to the point where they could injure someone. Going along with that, and especially without saying anything, or trying to change the situation makes you complicit.