And with more content comes more opportunities to target ads.

In order to target ads to your specific tastes, of course, some sort of tracking must be involved.

As an example, through the use of interest graphs companies like Twitter are able to target ads more specifically based on their users' individual interests.

So what if Google track my journey and place targeted ads in front of me.

Social networking sites use a lot more than just your history to target ads.

They can't use your history to target ads to you if you cannot see them.

This is only possible if the advertiser can target ads to you based on qualities about you.

"So we targeted ads and some direct mail to older women."

Every web site in the world wants to show you targeted ads.

Facebook uses all this data, and data about your friends, to target ads to you directly.