You can also copy the article title and run a google search for it. WSJ isn't paywalled for links from search engines (Google for sure at least, not sure about others).
We have come full circle. How about the submitter of the story does that?
It seems like WSJ inspects the Referer HTTP header, so it disables the paywall if it seems that you navigated to it from a search engine. So, it is not a property of the link.
This, of course, makes sure I do not get around the paywall, since I have disabled that header in my browser. (I dislike the tracking aspect)