The school where I visit is really average, some rich kids some poor kids, all kinds of backgrounds. The format of this career day is that each class period somebody will come and talk to the class that is somewhat related to the subject - so I usually end up speaking to a math or computer class. In a class of 25, there are probably one or two kids who already know some limited programming (or have made a website). Almost everybody that age is online (all Facebook, a handful of Twitter) and plays console video games. Probably about half have cell phones.
When they ask me questions, it's usually about how to steal their friends' Facebook passwords, conceal their browsing history, or build their own video game. I do spend some time talking about privacy, reminding them that their behavior online can stay around forever and that they should be careful who they are talking to online.