You do know that FB is the most mainstream social network, don't you? And there's a perfectly logical explanation for that: there are limitless opportunities for entertainment, education, business development and gaining new audiences, and simply making new friends from all over the world.
One can imagine how much content (Facebook videos, images, live streams, etc.) there is here to be inspired, be motivated, enjoy, or learn! It would all be perfect if Facebook videos could be saved offline so you wouldn't lose them and explore the content in your spare time without going to the platform again. To download photos from Facebook is much more straightforward, but saving Facebook videos is more problematic.
The platform itself doesn't have any Facebook video download tools, but I know a way out. How do I download a video from Facebook? I use the Facebook video downloader that is handy to use.

https://fbvideodownloads.net/