This kind of "lesson" should be learn in all classes... even better, in all the parenting classes. I completely agree with you saying that one of the key is "learn to know our boundaries" and that the children will do exactly what their parents are doing.
One more thing about posting on social-media-FB-type: there's nothing wrong with uploading, let's say, a nature-photo on the platform. The real problem appears when the motivation for posting is extrinsic, meaning that the only purposes are likes, comments, appreciations, attention, money. My opinion is that if you're posting for the beauty of that photo, for the emotion of the moment... or for teaching the others etc... then we're all good :) :) :)
p.s. awesome writing! I've really enjoyed this :)