Reporting

When you report someone, does that person know he/she/it has been reported?

No. (Unless there's some sort of hack that enables the hacker to see. I've never heard of such a hack though.)

Not in game or on the forums, since it's not clear what you're asking.

That would be funny.
Vaccing away and you get a pop-up "_____ HAS REPORTED YOU!"

Nope, the reporter remains anonymous..They really need to start banning people though.. i see the SAME people everyday at himes