I guess the point PPT is making is that the site does accept links to Facebook as evidenced by his successful inclusion of a link to FB.
Are you able to see that link? If not, then the issue would seem to be with your browser. If you can see it, then there is perhaps a more puzzling issue with the browser when you use it to post.
Perhaps try a different browser? Perhaps tell us about what you are using to post and/or view - both OS and browsing program /app...
There has to be an answer.
Rgds
FOR