What is a Facebook video widget?
A Facebook video widget allows you to share your Facebook videos on your website. The Facebook help pages show you how to post a video to your Facebook page.
How do I add a Facebook video widget to my website?
Go to Website > Widgets.
Click Add in the top right.
Enter the Title for the widget.
Under Type, choose Facebook video.
Enter the URL for the Facebook video (to get the Facebook URL, right-click on the video and choose 'Show video URL').
You can now add this widget to your website.