I’m not exactly sure what you’re asking. If you’re saying that you’ve posted some question here, didn’t get adequate response, so want to also post it on another website (say, snopes?) We have no problem with that, the post is yours (in terms of owning copyright) and you can do with it what you want.
However, if you’re doing it in a way that might stir up board-wars, that’s a no-no. For example, if you post here about how (say) some race/ethnicity/religion is inferior, get raked over the coals for being a racist fool, and then go to a dedicated white supremacist website and whine, “I posted this on the Straight Dope and they shot me down.” …well, that would be inciting a bunch of unwanted posters to come here yelling and foaming at the mouth, causing a fuss. That’s board-wars, and we do NOT want such.
Clear on the diff?
Firnally, posting the same thing (or essentially so) on these boards in different forums:
Our forum definitions are sometimes a bit wobbly, so we may allow this IF REQUESTED IN ADVANCE. Email or PM a Moderator to ask permission. We sometimes allow this as simply a cross-reference: “There’s a thread in Blah-blah forum discussing this… please go there to comment.” And we sometimes allow two threads on the same topic in different forums. And we sometimes reject the request.
That cover the bases?