You only have to put it out there though. It's job done then, isn't it? Look at this so far - 150 have seen the original post. About 100 or more fewer have then then read the follow ups warning against the content/source. That doesn't mean that those 100+ people believe what they've seen, but it does mean that any those 100+ who do believe it haven't seen a response to it.
"A lie gets halfway around the world before the truth has a chance to get its pants on." (Sorry, knockknock, I only know this one in English )