I think that privacy really resonates with the kids. They are right at that age where they area realizing that they like their privacy sometimes, and realizing that online there are so many things that are invading privacy to varying degrees really grabs their interest.
Convincing the kids that the internet has had a tremendous impact on communication seems easy, they seem very on board with the idea already. Last year I had a talk with the kids about internet marketing. I asked them if they had ever noticed how the adds that pop up on many websites will have links to items that they had recently viewed on amazon. We then discussed cookies, and the general sale of personal data by companies. The idea that websites are using your personal data to market to you was a good way of introducing the idea that we should be aware of how out personal information can so easily get out there.