With a little html code work, you can enable Facebook videos to play automatically with sound muted outside the social network.
Want to bring Facebook auto-play video to your site?
It’s now possible to enable Facebook’s auto-play on embedded videos from the social network.
The feature might appeal to publishers looking to leverage the video they produce for Facebook or to businesses looking for dynamic content to illustrate posts. The advantage of Facebook video — which has been embeddable on third-party sites only since March — is that it plays automatically without sound unless someone clicks, a feature that limits the surprise (or annoyance) factor for people who visit a page…
Now You Can Embed Auto-Play Facebook Video On Your Site