> it's not the medium it's the message that has an effect.

Exactly.

Thousands of years ago Socrates was complaining about the invention of writing which would "create forgetfulness in the learners’ souls, because they will not use their memories; they will trust to the external written characters and not remember of themselves".

Hundreds of years ago due to the invention of printing press "there was growing concern (...) that these cheap, plentiful books were seducing children into a life of crime and violence".

And today people worry about TV, video games, etc. - while at the same time holding books as the holy grail of knowledge.

All these are merely mediums for transfer of ideas. Blame the message, not the messenger.