The problem is this: whether you like it or not, you have an internal 'information loop' and people outside of your head can fill it with garbage.
So: do you really control your information loop, do you clean it up regularly, or do you delegate that task to somebody else?
Because the vast majority of people, me included, believe they are in control, while agreeing with complete garbage. And social networks, this one included, accelerate the dissemination of complete garbage.
