T. Boone Pickens, 117th-richest person in America (Forbes), states on his website (www.pickensplan.com [1]),

We have four new ads which are either on the air, or ready to go on the air. The ads have been “cleared” by every network… except for NBC which has refused to clear a 15 second ad about Iran.
In the ad (below) Boone talks about how the Iranians are moving quickly to vehicles powered by natural gas so they can free up their $120 a barrel oil to sell to us. Boone says: “Get this one. Iran is changing its cars to run on natural gas and we’re not doing a thing here …”
The problem? NBC wants us to PROVE that “we’re not doing a thing here.”
Sometimes you just have to wonder.