Don't use the picture icon at all. Just put the direct youtube link... it needs to be the smaller link, something like:
I really mean JUST find the link and copy/paste JUST the link directly into your message. It should look something like following (but I am putting in a few space just so you can see it... otherwise you'd just see the movie.
So the link I put in exactly like this http: //
www.youtube. com/watch?v=UYGXdVMBS20
and I see all those letters/numbers in my messsage. But when I put 'Post Message' it shows up like:
YouTube - Bretta Lee Wildhaus ExB Standard Run October 2010 Dreampark, NJ