We're talking about 5% of the 20th century because for most people the internet was only available for around 5% of the 20th century. Doubleclick wasn't the fi

We're talking about 5% of the 20th century because for most people the internet was only available for around 5% of the 20th century. Doubleclick wasn't the first ad network. There was acceptable advertising on usenet too in the form of signatures.