Internet technology has reached the point where people receive personalized advertisements. It used to be the case that all the ads I saw on the Internet were general ads. But now that Yahoo, Google, the United States government and everyone else has records on me, I only see advertisements that are aimed directly at me.
For example, whenever a new Nancy Drew game is going to be released, I see a ton of advertisements about it. I feel kind of bad about that, to be honest. It's too bad there's no button which says, "Hey, I already pre-ordered the game! Stop trying to sell it to me!".
For another example, I bought four pizzas from Domino's Pizza in January, when I didn't have a kitchen. That was six months ago, but Domino's still has me on their record of pizza-obsessed bachelors. Their ads pop up with great frequency when I use the Internet.
For a third example, advertisers know that I'm bilingual, so they sometimes post advertisements in Spanish for me to look at. The Spanish Mormon Church is the main group that wants my attention, followed by the "learn Spanish in two weeks" group.
I'm guessing that advertisement technology is only going to improve, in the future.