I agree that there should be some provision to be able to do this. Whilst uploading to Youtube (Vimeo?) may well work, some videos that appear on Facebook are not yours to upload to other sites. However, there are videos appearing on Facebook that one might like to write a commentary on as a blog post. It then becomes rather critical to be able to have the Facebook video appear in your blog post.
RE: Is there a way to embed Facebook videos to Steemit?