Have you checked in to your AdSense account lately? Try and see the Referral setup page and see whether you have been upgraded to Referrals 2.0. I was surprised by this notification when I logged on to the AdSense account of one of my clients. This is what I saw:
Some of us are lucky enough to be given the chance to test this out, like Auntie Lillian a.k.a. 5xmom. I am not as lucky, though. Maybe because my AdSense performance is not so well. 🙁
With Referrals 2.0 you can select targeted ads to display on your site, and not the boring old banners to refer to Google products and services. This opens a lot more doors and endless possibilities for you to customize the ads that will be displayed. They look just like normal AdSense ads, with the only difference is the tag Referrral Ads by Google.