Internet Granny

Like the usual grandma, but introduced to the internet and the good ol' fake news. They will attempt to share any type of scandalous/exotic information that have no base with any type of social interaction avaliable to them, this includes and is not limited to: family, friends, co-workers, relatives, pets, neighbors, the hobo on the porch, and so on.

And of course, they don't research about the information and completely trust the So-Legitimate-Joe with his thesis.

A: Dude, don't eat carrots! I've read that they can cause anal prolapse!
B: You're an absolute Internet Granny