I'm going to go on out on a limb and guess that this isn't really a case of censorship, because it's not like Facebook to not tell you directly that they've removed your content. Or they go the other route and post a disclaiming "fact check" under it.. but so far as silently removing posts, and marking them as "sent", seems more likely to be a bug. When I attempt to navigate to gnews.org the site is very slow, and I…
Probably downvoted because IMO that's a very weak limb you're going on, and the behaviour you're describing probably seems unbelievable to many users. But well, maybe it is shitty coder(s) mishandling timeouts.
It seems generally less believable that Facebook would censor people without telling them.
Other commenters [0] appear to believe the same as I do, and note that FB typically informs the user that their action/behavior is against the site's terms of use.