I would treat general information the same way you would cite a news source. Include an excerpt or synopsis of the other post and link to the source.

I don't know why your question makes me think of this addition, but I think I should also say that it is inappropriate to post something a FlyerTalker said elsewhere and post that info here. Not saying that I suspect you would do that, but it feels like it should be added as part of a complete answer.

I think that FT's privacy policy says that we shouldn't post any personal information about another FlyerTalker, even if it is publicly available, unless they have already made it available here. Memberships on other boards, and views expressed there could be construed as personal information.