Adsense Clarifies policies surrounding promotion for referral

Many adsense publishers don't know about the policies surrounding promotion for referral units, While the policies are generally the same for referrals as for standard AdSense for content ad units, there are a few minor differences.

You can endorse or recommend products you've chosen to refer on your sites, but we ask that you only make recommendations when you're familiar with the specific product and you've decided not to use the 'Pick best performing ads' feature for that ad unit. For example, if you're familiar with a specific travel agency you're referring, you may use language such as "I use this agency and recommend it to book your next vacation." By being honest with product recommendations, you can help build user loyalty and trust, which will benefit your site in the long run.

significant differences between these two types of ads, the most important being that advertisers only pay for traffic from referral units if the user performs a specific action the advertiser has designated (such as making a purchase from the site or signing up for a newsletter). Please keep in mind that there is a fine line between recommending a product and encouraging your users to click on a referral button for personal profit. Publishers may not ask users to click on the referrals to help them earn money, and may not refer themselves to their own referral products. In addition, publishers may not draw unnatural attention to their referral units with arrows pointing to the units or other similar methods.