Are we not we? We are mechanisms!
Are we ourselves, or our usernames? If someone else signs on as us, are they taking us over and becoming us, or are they someone else wearing our skin?→
[More:]If, say, I give an account to a friend, and never use it again, folks who are paying close attention might register a personality change, but that's it. So does responsibility for what I've said in the past through this hypothetical account lie with the new user? If someone gets hold of my login, are they my username now? It's like Invasion of the Body Snatchers! There are loads of other corollary q's and a's that go along with this, but my brain is beginning to mushroom out of my ears.