I have linked to very conservatibe sites on FB with no problem, as well as VERY liberal sites. This is a very rare case where a post gets deleted in my own experience. I had one earlier, but it related to an historical point about Hitler, and I at least understood why their "AI" thingee would trigger. (It was a very negative point about Hitler of course.)
I don't see any basis for thinking RCP is hard right wing, or off limits. I did manage to slide the link in as a comment elsewhere. I know these are algorithms, but this one struck me as odd.