Yes you, but your name isn't a good enough answer is it? Maybe that's because two different people could happen to share the same name. But what about your email address? Even if the sysops don't mess up, though, that won't do either: whatever else you are, you're more than a virtual mailbox. The problem is: your name is only yours because other people use it to refer to you, so the question remains, Who are you that people call "foobrain" (or whatever)?
Am I my body?
To be continued. . .