I think what the parent poster implied was that older people who aren't very technologically savvy, as in the kind who would define Facebook as "the internet",

I think what the parent poster implied was that older people who aren't very technologically savvy, as in the kind who would define Facebook as "the internet", don't appreciate how easy it is to publish materials online and so they give any old bullshit that shows up in their feed more credit than it deserves. I believe this might be because they understand publishing on mediums like television and newspapers is hard and requires capital, so they assume that must be true of the internet also. This is in contrast to a younger audience that is more technologically savvy and understands how easy it is to publish and propagate information. But it's dangerous to generalize. I know a lot of older people who are incredibly technologically savvy and younger people who only care about the narcissistic and quick-consumption facets of technology.