When people post scare stories on Facebook that are hoaxes, should I tell them? How could you be polite when doing so?

I often see stories on Facebook that are so obviously hoaxes. For example there’s one about the Talking Angela app I saw the other day. Another one about a series of women getting raped when they go to help a crying baby/child at the side of the road. Do you point out that they are fake? I’d like to but I don’t want to offend the person, so I tend to say nothing. Once or twice I just put in a link to the story on Snopes or another hoax busting site.

I hate the fact that these stories get spread around, causing fear and misery unnecessarily. Especially the ones about women getting attacked as I feel that they are deliberately intended to keep women fearful and not able to stand up for themselves.