Facebook challenges email for control of your online identity
techcrunch.com
techcrunch.com
The scary part comes in when you think that if this technology becomes popular, new services might provide account recovery or identity management features solely through Facebook. As we've seen countless times in the past, centralization like this only makes it a better target for abuse by malicious actors (Facebook included!).
Email is provided, by a third party (email service or, at the very least, domain name registry). Identity is inherent property of its owner.
Passwords suck, but happily disowning identities, letting third parties lease them - that's scary.
Although you can argue this is still a service, it's way better then Facebook.
Also multiple personas online is a feature. Unless in rare cases, this doesn't replicate in real life.