In years past, a person died, and eventually all those with memories of him or her also died, bringing about the complete erasure of that person's existence. Just as the human body returned to dust, mingling with atoms of the natural world, a person's existence would return to nothingness.How very clean.Now, as if in belated punishment for the invention of writing, any message once posted on the Internet was immortal. Words as numerous as the dust of the earth would linger forever in their millions and trillions and quadrillions and beyond.