2

In the user page there is add openid link? Why would one need multiple OpenIDs?

Thanks.

4

In case one of your OpenID provides suddenly disappears, it saves you a lot of hassle from having to email Stack Exchange and proving your identity. Instead, you simply login with the other OpenID and everything continues to work fine.

3

I think this says everything:

MyOpenID account mysteriously vanished

Occasionally, your OpenID provider (external to Stack Exchange) does something crazy.

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