"To date, the meetings have been presentations of positions without any real engagement in terms of counteroffers, so in a sense they have been talking past one another, " he said.

WSJ: Iran Pushes Back as West Awaits Nuclear Offer Response

This is very different from the endorsements of the TV era, where one 15 second spot could be played over and over again without any lasting personal engagement between star and product.

FORBES: Celebrity Endorsements: 15 Minutes of Fame...Or Shame?

This person will do the obligatory Tweets during the course of a day without any thought to content or more importantly, engagement.

FORBES: Move up http://i.forbesimg.com t Move down