fb:swf code for your Youtube video
<fb:swf swfbgcolor="000000" imgstyle="border-width:3px; border-color:white;" swfsrc='http://www.youtube.com/v/YOUR_VIDEO_ID?fs=1&hl=en_US&rel=0&autoplay=1' imgsrc='http://YOUR_IMAGE_LINK?ver1.0' width='520' height='322' />
Depend on the design of your fbml page, you can also tweak the image size as well.
Here’s some sample of it.
Watch it in action!
Extra Notes: Facebook Cache every images in there static FMBL app
Also Facebook will cache every image that you push to there site. If you would like to update your image on the static FBML tabs, you will need to put a version at the end of your image link like ?ver1.0 . This will give the page to reload the image. If you have another update, just name it ver1.1.
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