I've seen some marketers put notes on the bottom of their e-mails whenever they promote affiliate products that mention in some way or form that if I click on the link, it will take them to an affiliate page and if I decide to buy, they will be compensated (one marketer uses a humorous approach in saying this ).
Is this a law?
What if you have affiliate links inside an e-book you create or your Facebook fan page or even if you promote affiliate products via Facebook ads? What if you create one of those Amazon affiliate stores? Do you have to mention that you will get paid if they purchase for these places, also?