This question already has an answer here:
There are many posts on social media that are a load of rubbish and just plain factually incorrect. They often end in “if you don’t share a fairy will die” or some such nonsense having bad luck. I usually just ignore them because it’s not worth the effort of entering a discussion with the person who shared the post and don’t cause much harm IMO.
However sometimes these posts are dangerous because they give bad medical advice, such as the posts about so-called “cough CPR”. A quick Google will usually take you to a site like Skeptics.SE or Snopes.com which has the facts.
In such cases I’ll sometimes post a quick comment like
Sorry but this ones a myth 🙁
With a link to a Skeptics, Snopes, or some other site with some info.
However I don’t want to be the person that’s always telling people they’re wrong, even if they are, as often the posts are shared with good intentions.
So how can I politely inform people the post they shared is wrong/dangerous/bad advice without being annoying?
Bonus if you know how to get them to stop sharing such stuff in the first place.