Re: @ tannin - The "value" of advertising
The main difference between online advertising and advertising in traditional media is metrics. With online advertising you can know exactly how often an ad has been "displayed" and how many have responded (click through on the link). Advertising in traditional media is more vague in that you can't say how many people have actually seen and/or paid attention to it, let alone been convinced to do whatever the ad was for...
Biting the hand that feeds IT
