Why Are Social Networking Sites Like Facebook and MySpace So

Why are social networking sites like Facebook and MySpace so exciting to sociologists who study social networks?

A) For the first time, social networking sites offer sociologists a data set rich enough to test ideas that until now have only been theorized.
B) For the first time, sociologists have realized just how much the Internet has changed social networks.
C) For the first time, sociologists don't have to spend the time and money to go talk to people and can do all their work from a computer.
D) For the first time, sociologists can find out what young people's social networks look like.
E) For the first time, sociologists can track the spread of urban legends.