What I try to do in those cases is find something to say about the content itself. Could even include the 'thanks' that way if you wanted. Like, "Thanks, I didn

What I try to do in those cases is find something to say about the content itself. Could even include the 'thanks' that way if you wanted. Like, "Thanks, I didn't realize that <interesting thing learned from the post>." That way you're at least contributing by drawing people's attention to an interesting part of the original article.