Optionally you could also restrict posting to the users registered
del.icio.us email address ?
And how exactly do you reckon you could prevent people spamming del.icio.us with faked email addresses? Just take a look at the daily amount of spam you delete and/or your spamfilter stops, pretending you have a paypal account which needs looking after. I would guess you'd need to send a password somehow in order to really authenticate. Sending a password in cleartext via email is unsafe as hell (though I guess this is not your bank account, it's still not really a good way of doing things), and using encryption for it makes it hard to use for consumers. To be honest, even though I think the idea is quite nice in essence, I think it would be hard to do securely and without allowing for more spam - or did I miss something here?
Just my two cents, or something :-)
--Gijs
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