>That muddies the water by treating all adverts the same, when sometimes (like the t-bell example above) the celeb truly likes/uses the product. But you admit

>That muddies the water by treating all adverts the same, when sometimes (like the t-bell example above) the celeb truly likes/uses the product. But you admit this is irrelevant because you don't know if that person has any in-depth knowledge. Nor do you know/trust that person. In your scenario that person is just a voice on a radio saying Trust me I love Tacobell and eat it all the time. Trust is an interpersonal social currency, gained via social interaction. If there is no prior social interaction between the advocator, and the person being advertised too... How can there be trust?