BBC News Night
The UK based news company the BBC hosted a feature on the BBC news night program investigating this new marketing technique and how it all came about. It focuses on a US based site, but the principles are the same in the UK.CNN
CNN America conducted an investigation into referral marketing websites based in the states and how they work.News Articles
New York Times - This is an article taken from the New York Times. Read it hereWired News - Wired news looks at the business behind the free gifts. Read it here
National Public Radio - An audio clip taken from a radio broadcast discussing this marketing technique. Listen here.