Using Facebook to Learn what we need to Learn?

After reading Chapter 5 in Kist's book, the section that "bothered" me the most would be "How do we use Facebook to learn what we need to learn." I understand that Kist feels that social networking could be used with school, but his ways bothered me a bit. Yes I use Facebook to communicate with friends or group members on a project we are working on, and yes in college I am friends through Facebook with some of my professors. However, I do not feel it is appropriate for teachers to communicate with high school or younger students through social networking. I understand the group was protected and only allowed the teachers and students to join, and I understand that it was strictly for school/projects/homework. However, I do not feel it is right. Many schools today set up student e-mail accounts through the schools for students to contact one another for projects and such and for students to be able to contact their teachers, and vice versa, outside of school. Facebook in my opinion is going way too far. Through that group a teacher can gain access to their students Facebook account information and such, and can see when and how long each of their students are on Facebook. I just feel that it is not appropriate for high school and lower. I understand that today world wants to include technology in their lives as much as possible, but Facebook for school is not right in my opinion. Sorry, but I do not agree with it.