OK, I admit I'm being lazy this morning and asking a question here instead of going to YPN and looking it up for myself. Does anyone know if YPN prohibits its ads from appearing on the same page as AdSense ads.
Specifically, I'm thinking of an AdSense link unit on the same page as an YPN ad unit. The appearance of the two would be very different. (or as AdSense puts it, they wouldn't "mimic" each other)