You can now sign in!!!
Edit: It's up for some places but still down for some, I think it's being restored
Edit: If you can sign in it might be that it's not up for your region or you may want turn your playstation off and then turn it on
Edit: some people can sign in now but can't play destiny
Edit: Now working for almost all regions
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I was able to sign in to psn and destiny, southeast Michigan.