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Social login options are not federated across communities? StackOverflow allows GitHub, but Ask Ubuntu does not?

cn flag

[I would ask this in Meta — but I have only 1 rep here; upon being forced to create a new account, I have 700+ in StackOverflow.]

I don't understand how communities are related, but not federated, identity-wise.

Stack Overflow login options screenshot:

  • Log in with Google
  • Log in with GitHub
  • Log in with Facebook

Ask Ubuntu login options screenshot:

  • Log in with Google
  • Log in with Facebook
  • Log in with Launchpad
mangohost

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Most people don’t grasp that asking a lot of questions unlocks learning and improves interpersonal bonding. In Alison’s studies, for example, though people could accurately recall how many questions had been asked in their conversations, they didn’t intuit the link between questions and liking. Across four studies, in which participants were engaged in conversations themselves or read transcripts of others’ conversations, people tended not to realize that question asking would influence—or had influenced—the level of amity between the conversationalists.