Dare suggests that WebFinger might be more useful in making your online identity portable, rather than for its intended usage for end users. Which I agree with. I would like to keep all of my online identity in one place, but I have to take issue with the use of an email address for any purpose other than sending and receiving email (and I admit, I use my gmail address for plenty of authentication out of necessity and convenience), because it encourages and softens people up for abuse by the password anti-pattern.
If there's one thing I appreciate about Facebook, LinkedIn and their kind, it's that they shield people from my email. I don't want to ever give anyone my email, because I want to be able to turf it if I need to, at which point, people can still find me on Facebook etc. But, it's true, having an uncommon name is a mixed blessing. WebFinger seems like a good idea, but it also sounds kind of like it's grooming people for the password anti-pattern. We should be telling people "Don't give away your email, don't give away your email password..."
(From my comment on Dare's blog)
This what my daughter thinks about gatekeepers: