I just associated a second OpenID with my account, and I notice that I now have a "swap" option which will swap the new one to be my "primary" OpenID. But is there any reason I would care which one is primary and which one is secondary? I can still log in with either, as far as I can tell, so what is the difference?
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Once you have two associated IDs, adding a new login replace the primary ID. If you wanted to replace your alternate ID instead, you'd need to:
I haven't seen any difference between the two when I've used them. I believe that it is simply so that you can have a backup in case of a problem with one.