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So you think identity for 10B internet users should be centralized ? And then users would be able to login into other sites with this central identity provider ?

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I honestly don't like the idea of centralizing / federating such a system. One bad actor and bad management of backups, yikes... In fact, nowadays, most people don't even have valid backups (that automation can't tamper with). This doesn't even get into anti-tampering, i.e. GPG signatures and the like.

Outside of that, I believe that every nation would have to agree (hah!) on some naming or ID standard.

All of that said, I think it would make sense for small communities to have a master-master LDAP setup for all their web, chat, various apps, forums, etc. i.e. Keep things off facebook and google.

This 'master-master LDAP setup' sounds a lot like mastodon's federation (not login with Google federation) and the problem with that is an user often belongs to many communities or may change from one main community to another during his life, so he would lose all his data when moving.

Yeah, they would have to register their username, etc... in each community. It is a middle ground between stand-alone websites and global federation. There are certainly pros and cons to each.

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