How this works. A note you throw in sinks out of sight for as long as you
chose, and only then can it wash up for somebody else. It is kept on the server,
so these really are other visitors’ notes and yours really will outlive your
visit. Nothing is attached to it — no name, no address, no id — which
also means it cannot be edited or taken back. Nobody reads these before you
do: links are refused and the length is capped, but there is no moderator.