Good stuff. Some of users faced the strange problem. They send the invitation referral link from FAQ section. This link has their userid. But, when their friends signup, they remove the username in the referrer field of the registration form!
Strange, isn't it?! I don't know what kind of friends are they! Anyway, our users want the referrer field to be read-only if the referrer name is passed in the URL. Till now, I haven't used this hack. Users copy the invite link from FAQ area and send it thru emails. If your hack has some kind of configuration by which you make the referrer field read-only, that would be nice.
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