This is related. I have not tried SNAP for Facebook yet. What we are finding is that Facebook is blocking all shares of posts IF you have a link in the post summary comment at the top of the post from your WP page. So, if you have the title and a short link above the box that encloses the picture and article from the link, FB prevents it from going viral.
Does this “option” apply to this situation or fix it? Basically FB is making automatic updating relatively painful, in that you have to go into each post on FB and delete the short link
