I think you're right--more people might start using services like TinyURL. In that case, somebody would get the TinyURL link as a referrer.

My suggestion would be to at least display it in some way if a user/journal has Google Analytics enabled/implemented on their journal. On the profile page might be best. So people who are concerned about it can check before they might risk getting into trouble

Well, except things can change. Somebody could not have it, you link to them, then they set it up the next day and people are clicking on that link.