There have been Downloader for many platforms like Youtube for a while, now there is also a Facebook Video Downloader available. So with this service, you are able to download any desired video which is available on Facebook.
The only action you have to do is to copy the link of the desired video and insert this facebook link into the input box which is seen on the frontpage of fbdown.net. Now you just have to wait some seconds or minutes, depending on you internet speed and you can enjoy the video on your own device without a connection to the internet. To use this awesome service you do not have to pay, no one will charge you any money.