What is the reason I can sign up on Ask Ubuntu with Ubuntu SSO and cannot log in with it on other Stack Exchange sites?

Why does Ask Ubuntu differ in that case? Of course, I can use Google, Facebook or simply Stack Exchange login, but it isn't the way.

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    Check out Gaming. I'm pretty sure that they're the only site that has a explicit Steam icon. – ChrisF May 6 '14 at 18:33

According to the Ubuntu Wiki the Ubuntu SSO is an OpenID provider which means you can use it on any of the sites. But only Ask Ubuntu has it called out in a button, instead of forcing you to type in the OpenID URL which is https://launchpad.net/~your_ubuntu_username .

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