On a semantic point, I think it's worth distinguishing between geeks and nerds.
Geeks know stuff. They have a greater than average level of professional skill. They get stuff done, even if non-geeks find it hard to understand the value of it. Typically, they are constantly searching both to deepen and broaden their geekiness. Because they are creative and knowledgeable, they tend to be interesting and dynamic, if at times a little puzzling. Typically, geeks are both enthusiastic evangelists and self-effacing. Often, they're polymaths whose expertise embraces several fields.
Nerds on the other hand, are both dull and common. They tend to have an obsessive yet shallow interest in a technical field but little real love for it. They're more interested in accumulating kit than actually doing anything with it. Their creativity at best extends to unusual configurations of off-the-shelf equipment or ideas. In company, they will tend to bore the pants off others with their droning about non-topics and one-upmanship about their gear.
Probably around 25% of males over the age of 14 know how to build, configure and maintain computers. But most of these are nerds rather than geeks.
Nerds are into overclocking. Geeks design integrated circuits.
Nerds know all the latest cool apps and utilities. Geeks write them.
Nerds spend most of their spare time gaming. Geeks write the games they play (and then spend their spare time gaming).
Nerds design web pages. Geeks design web browsers...
and of course likewise in other fields than computing.
That's a bit worrying, and even more worrying is that if I bought my son one I suspect he would use it!! 
