I was posting a YouTube video link to my Facebook account and for the second time in the last week or so, Facebook didn't generate the preview of the video. So the Facebook post was just my text and the link to the video. After checking numerous websites and blogs on how to fix it, I did my own research and found the fix. 

So instead of my usual Windows video, here's a Facebook related one, why it happens and the unbelievably simple solution.

For complete instructions and a walkthrough
watch the video below