Judging from Dimitry's past comments (on this thread, and on others related to the migration), I don't think that he would like his identity to be "represented" by SE Inc. at all. But there are more options to this anyway.
]]>That’s a major bummer for site networks like us with multiple domains. We use the OpenID string as your user “fingerprint”, so if your “fingerprint” changes, we can’t tell who you are any more. It’s a frustrating problem, but we think we’ve finally come up with a fix: we demand email from Google GMail OpenIDs! [Emphasis as in original.]
The following is a guess, perhaps not even an educated one, but it seems a reasonable scenario to me:
As suggested in the blog post, your OpenID string for stackexchange.com is considered as your 'fingerprint' by SE (in the sense above). This OpenID string is likely the same over all the others sites except MO you use, as all you use seem to be [something].stackexchange.com (yet not stackoverlflow.com for example), so the domainname is the same. Likely, you granted SE permission once, and now long ago, when you started using math.SE (or whichever the first site it was you used on stackexchange.com); they then stored this email-adress as explain in the blog post. All the time you use some SE.com google gives then your OpenID string for stackexchange.com, they recognize this string and thus there is no need to ask for reconfirmation of the email. However, when using MO now, google give your OpenID string for mathoverflow.net (which is different as the domainname is different, and thus google creates a different one for the same email), therefore they do not recognize the OpenID string, and thus ask for the email to identify you via the email-adress instead of by the OpenID string.
The reason that this was a non-issue on the old MO is that there was only one domainname at all, and no accounts to be connected. Now I did not test this, but I assume that I just the other way round would be asked for each stackexchange.com site all the time since my 'fingerprint' is my OpenID string for mathoverflow.net. (Which seems compatible with what Scott Morrison said, since the OpenID string they have for him as main one is likely also not the one for stackexchange.com but mathoverflow.net or perhaps also stackoverflow.com as he seems active there too.)
]]>What is amusing here is that any OpenID provider can employ such a scheme, but StackExchanges only singles out Google.
]]>“There is one, and only one downside: we must demand email from Google OpenIDs. Email is not usually required to use our sites, but you can’t log in via Google if you refuse to provide email to us. You can always switch OpenID providers, of course, but we regretfully must make the email demand mandatory in the case of Google.”
And of course, somebody voiced the same privacy concern there, but it was ignored by StackExchange (hardly surprising, given the identity of the author of that post).
]]>But you are right, this is getting off topic. I'll stop participating in this thread now.
Have a nice day.
]]>@Scott Morrison: I have no desire to post anything on other Metas (e.g., meta.stackoverflow.com) given how they treat their users (see, for example, the conflict between Jeff Atwood and meta.math.SE, which you are probably familiar with).
]]>My Google email address is private and is not meant to be disclosed to others, especially not to StackExchange. Furthermore, my user account on MathOverflow already has an email address associated to it, and I don't understand why StackExchange would demand another one from me, especially in such a rude manner.
How do I resolve this problem and log in to MathOverflow without StackExchange invading my privacy?
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