Step 4: Embed a YouTube Video
This code will embed a YouTube video into your page.
Replace ID_HERE with the real video id from the YouTube URL.
You can also change how big the player is, but be aware that the width cannot exceed 520px, and that due to Facebook's security protocol, the user will need to click on the video to activate the plugin.
(The editor stripped out the < at the beginning of the code, so you have been warned)
fb:swf swfsrc="http://www.youtube.com/v/ID_HERE" imgsrc="http://img.youtube.com/vi/ID_HERE/default.jpg" width="480" height="360" />More info:http://developers.facebook.com/docs/reference/fbml/swf