But, when you do what you did, posting a link which is a referral link and not just the original site, the good manner is to at least mention that it is a referral for your account..

I noticed it, but others might not notice it and it is never nice to be sneaked into a referrel system. Who knows, maybe people know a friend who they want to be referral of or maybe they dont want to be in the referral system at all..