Oh man, when there was a big surge in the US in diary-keeping -- I think it happened in the seventies, partly urged along by Anais Nin -- there were actual articles on "why should people keep daily records of their dull little lives," "how many of these will be reread even by the people who write them," "doesn't this point to a huge and worrying rise of egotism and narcissism in the culture," on and on. Same thing when people started being able to take cheap photographs on their own during vacations, rather than rely on postcards. There's still this fascinating (and enraging) rockbed belief that if it's not documenting the Life of Someone Important, it doesn't matter.

And going back to the whole "copies are not reality! This is a disaster!" thing, IIRC novels were thought to be actually unhealthy for people to read too much of, in a Don Quixote way. You can't get "reality" from books! or photographs! or online photos! or....