I tried to verify that the adverts used the same code, but I couldn't. Looking again I see that they do still use "DF" as the referral code, so I guess they are

I tried to verify that the adverts used the same code, but I couldn't. Looking again I see that they do still use "DF" as the referral code, so I guess they aren't making any money from this. I take back my "spam blog" accusation! :)