The two slashes were located where the video would have been. However, I tried two other posts with text only and the two slashes still showed up. Again, you can see a quick image of it here: https://screencast.com/t/NzEzNjllMzA
Ideally, I would love to get this on the wall of the fan page however. I noticed somewhere you had posted that you needed to update some of the code to deal with something in relation to the “tab url” issue. Has this been done? If so, maybe I should try it again!