I am still not sure how big deal this is in practice. Even if this is true, don’t now if it matters to all the people benefiting today from Facebook as a way to organize. Like the metaphor, though.
Again, I think of the way my nephew uses the computer. He wants to use a computer to do something, whether it’s look at pictures of animals (he’s a fan of rhinos and dogs) or watch videos on YouTube. And while he’s doing those things he’s poking the screen, expecting an image to expand or a video to stop or start upon meeting his fingertip. This is the way he interacts with almost every other screen he’s come across, and so he carries the expectation to the ‘puter.