It's actually amazingly common. I don't remember the specifics, but I saw a really interesting story about this. Whenever someone disappears, investigators will

It's actually amazingly common. I don't remember the specifics, but I saw a really interesting story about this. Whenever someone disappears, investigators will immediately setup various internet honey-pots. Apparently the vanished, very often, simply can't stop checking in on their old selves. Including folks wanted for very serious crimes.