I have no idea how good the science behind this is, but it's fascinating even if it's total bullshitake. If all humans suddenly vanished from earth, how long would it take for the planet to obliterate all traces that we were ever here?
Mickeleh's Take: No, the Rapture doesn't count... this timeline kicks in when we all go together. All us us, why not take all of us? BTW: this isn't a Web 2.0 view. There's no mention of when blogging stops or when Google servers shut down. I would expect spam to cease pretty darn quick, but that's doubtful.