Re: another bloody silo that nobody needs
extending IMAP probably isn't the right way to do it, especially if existing private e-mail systems NOT running Dovecot suddenly become "incompatible" because of it.
Any kind of central "real world identity" system is RIPE for abuse. Period.
Spammers and scammers WANT to be able to connect a real-world identity with an online one, especially if you use multiple e-mail addresses, IRC handles, gamer IDs, or "any other presence". If they can't track you CENTRALLY, in order to monitor you for advertising (or other) purposes, they'll do it via the "real world identity" thing.
Don't forget, Micro-shaft NOW has that "Micro-shaft Logon" which was first excreted in the early part of the 21st century as part of their "Dot Not Initiative" - aka "Micro-shaft Passport", which was a TOTAL flop even when compared to the whole "dot bomb" thing.
maybe its time to divorce from the Faecebook way of doing things, and go back to something that doesn't track you or spam you with ads, like USENET and IRC.