I think AdWords has been disruptive in advertising. The concept of extremely targeted ads being unobtrusively shown to you only while you're seeking informatio

I think AdWords has been disruptive in advertising. The concept of extremely targeted ads being unobtrusively shown to you only while you're seeking information is huge. Compare that with offline CPM ads that are shown to tons of uninterested people within some demographic. With AdSense, anyone can make money online if they have good content. Online advertising was around before AdSense, but it was more about distracting visitors with flashing animated ads than contextual text ads.