A user needs to register coming in to your site from another domain. To test it, you need to clear the domain cookies, close the browser, go to another site (or search engine) to click to your site from, and register a new user.
The http_referer shows up in the user profile field. Of course it's only going to work for new registrants.
A better way to view the data would probably be ideal. I'll put some thought into that and ideas are welcome. The important thing for now is that the data is getting written to the user profile for now.
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