Someone posted a link to
Delving further, we find
https://secure.wikimedia.org/wikipedia/commons/wiki/Main_Page says
Welcome to Wikimedia Commons, when in fact the real site is
http://commons.wikimedia.org/wiki/Main_Page . Or is it?
In fact on any page on either site, one cannot find any link to the
corresponding page on the other site.
So now everybody will be passing around two times the amount of links to
what in fact is the same material.
OK, I found the pattern for converting one to the other:
https://secure.wikimedia.org/wikipedia/commons/wiki/Category:Hogtie_bondage
_________________
http://commons.wikimedia.org/wiki/Category:Hogtie_bondage
One would hope the owners of Wiki[pm]would redirect etc. one to the
other, to stem the proliferation of non-canonical links.