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Now, before you think I'm getting all bizarrely and uncharacteristically philosophical all of a sudden, I shall note this pertains only to the internet. Anyhow, with that out of the way.
With a select few exceptions, it is physically impossible to prove that you, are, in fact, who you say you are. Evidence can be faked, yadayadayada. This, as a whole, leads to a variety of unfortunate situations that I won't go into detail of here. It also leads to a level of disconnection, due to the problems involved with verifying, that, yes, this human being is in fact this human being. And now I'm rambling, so 8luh8luh.