You sir are full of hot air. All those services have as many fake and malicious users as they do real ones and claiming a user's digital presence in sandboxes owned by corporate entities is an extension of their real identity does not give enough credit to the users of those sandboxes.
Actually he's right. The typical user (which none of us here are) has one account on FB (and "maybe" a Twitter account). That account they use to connect to friends, family, whatever. They see a Facebook Connect logo on some site they want to comment on, they gonna use what's familiar.
