I found a great site which could be used on both ends of your argument. Imagine seeing a $100 dollar bill on the floor, picking it up, and realizing that it's an ad for local business. You can see an example at DropaBill.com
An ad (other known as an advertisement) makes a person buy or sell a product or change a person's opinion about another product and tells them to buy their product instead for an easier living.
An advertisement contains information about a product or service that is available for purchase by consumers. It usually has: details about the product or service, where it is available and how much...