Why Are Social Networking Sites Like Facebook and Twitter So

Why are social networking sites like Facebook and Twitter 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 do not have to spend the time and money to go talk to people and can do all their work from a computer.
C) For the first time, sociologists can find out what young people's social networks look like.
D) For the first time, sociologists can track the spread of urban legends.