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The interface'll have the be unbelievably amazing and innovative for this to even make a dent in people's minds. And as others have pointed out, Facebook.com is not associated with professionalism (unless you're a recruiter or tech blogger or something). All in all, I think nobody will care at the end of the day. |
I guarantee you that they are going to become the default address between people 16 and under. My brother is 16 and doesn't have an email address, but he does have a facebook account.