Most alternative social media sites will not allow links to facebook videos. The reason being most of us here left facebook for a reason and that is why they don’t allow links to facebook videos.
If however, you find a video you think should be spread far and wide on alternative social media, you have a couple of options:
1. Copy the link then Paste it into the snapsave app and download it, then repost it here. https://snapsave.app/
2. The snapsave app doesn’t always work for facebook videos, but there is another alternative and you use it in the same manner. https://fdown.net/
If either of these Apps don’t work, it is probably because the original video’s Privacy Settings don’t allow it to be downloaded and if so there isn’t much you can do about it except try to find the same video posted on YouTube.
It is pointless to try to download anything but short video clips lasting less than 30 minutes long ideally, because anything much longer than that won’t upload on most alternative social media networks.