What is theknownunknown.com?
theknownunknown.com allows you to communicate something to someone else anonymously.

How does it work?
Someone knows something about someone else.

That someone wants to notify another someone about that someone else, but doesn't want anyone to know who they are.

theknownunknown.com is the FREE service that allows someone to do so 100% anonymously without the worry of someone finding out who is who.

Example usage:

Ask yourself, do you know the unknown?