Why would Original Referrer be blank?

[Anonymous]

Anyone have any thoughts as to why the "Original Referrer" field would be blank for a lead that converted on our website?

[Anonymous]

Original Referrer is the referring URL to your website.  When leads go directly to your website this will be blank; in Google Analytics this would say something like "Direct" as the source

[Michelle_Tizian]

Yup ditto above about the blank record. In a lead record, you should probably look at the original source type: in this case it 'll be Web page visit or salesforce.com

If you look at the original referrer, say if someone clicked on your google adword campaign, this original referrer field might show http://www.google.com or doubleclick.net.  

You might also see your marketo landing page as an original referrer. 

[Anonymous]

Hi, in our case it's not blank but it only contains subdomain info. How can we keep the external "Original Referrer" info?