I have not looked into the communities, but as http://www.skepticexchange.org/ (area51 link: http://area51.stackexchange.com/proposals/12612/skeptic-exchange) has about three times as many committed stackexchange users, one should prefer that place, instead of unnecessarily splitting it.
They appear to have different focuses. In any case, I’ve signed up for both.
I have not looked into the communities, but as http://www.skepticexchange.org/ (area51 link: http://area51.stackexchange.com/proposals/12612/skeptic-exchange) has about three times as many committed stackexchange users, one should prefer that place, instead of unnecessarily splitting it.
They appear to have different focuses. In any case, I’ve signed up for both.