In one case the FB account belonged to a Bar owner who used my video to promote the band playing at his club. All he had to do is link to my YT video, but instead he decided to copy it. If he had only asked, I would have made him a video with the Bar info in it, ..for free.
I know how to manipulate Search engines and such, but I just don't feel like gaming the system after 2 days of recording/editing, and yes, his account has many followers and activity.
For me FB is just a means of communication, sometimes I ignore it for weeks if I don't need it.