the term "geek" is incredibly hard to define, as there are dozens of subcultures within the overall classification. a geek usually uses the computer a lot, or other technological items. for further reading, I'd suggest looking it up on the Wiki, they have a very similar bit there to the book.

Geeks are "forced," as you put it, due to the fact that they are different from the norm, as most different people are, except within their own society.