You may not know this but there was a time when, like social media, people were scared to death of Fluoride. Yep, the stuff that's in your toothpaste to help prevent cavities. When I was a child there was a movement to put Fluoride into drinking water. The population rose up indignantly claiming, amongst other things, that it was a Communist plot to poison us all. I recall my parents and our neighbors in hugely emotional discussions about Fluoride. (If you Google "fluoride" you'll see that it is still unpopular in many circles).