12. Are Social Networks like Facebook real communities? Why/Why not?

yes and no.

In this world there seems to be two societies. An offline society where people talk face to face. Another society is an online society, where people get together on the internet.

So, some people may consider communities online the same as offline communities. Online communities may talk about the same topic as offline communities. Online may have even more attendance, because you can join the talk anytime, anywhere. 

On the other hand, some others may say it is not a real community. No ones there. They are some random people with same opinions or idea. You don't talk face to face. The word community comes from the word commute. To commute means to get sympathy through mutual communication. So the point is, there is no meaning unless you don't talk face to face and exchange ideas using our mouth.