@fabio. Even though I say it all the time, I honestly think it is all three.
Whether original malicious misinformation, or the stupid parroting of misinformation, or the algorithms tuned to increase or decrease the circulation of misinformation based on the owners‘ goals, all of these work against good information hygiene, which in turn makes us all feel dirty.
I reject the role of button mashing hot-head which many organizations wish to cast their customers; who wants to be an emotional vending machine, right?