I know Twitter works easy (just post the link) but how do I do it with Facebook posts? I searched for the answer but could’t find it :/.
If they support opengraph or oembed it will work. Obviously they must be public.
Did you try pasting in a Facebookost? (That’s what I would try before searching. The proof is in the pudding.)
As @codinghorror said, it’ll work only for public posts.
You may try my plugin