Should Facebook be allowed in school?

My Facebook profile. Screen capture.

Facebook? School? Allowed? What? You might be thinking to yourself, what is she thinking?! There are some people who think Facebook should be allowed in school because they think it would be beneficial for them. How could it be beneficial for teenagers to be on Facebook during class? Well to start off students are on Facebook all the time, so why not make a Facebook site for the class? It could give the students opportunities to talk about assignments, due dates, tests, projects, etc. over their favorite social networking site. And if anyone has a question about an assignment or project or test they can post it on the wall and someone would more than likely answer within minutes. There's a few classes I'm in that have made a Facebook page for the class. (Like this one!) The teachers mainly post useful information and reminders, which is nice.
Obviously there are some downfalls to it too. Students can easily get distracted by someone chatting to them on Facebook chat, they could be visiting someone's profile, looking up different things to "like" and so on. If there would be a way for the teacher to monitor that then I think it would make a huge difference. The teacher could have some rules about it, such as; log off of the chat, consequences for wandering off, etc. Facebook has become the most popular social networking site, as of now, and I think teachers should be able to incorporate that into their lesson somehow. So, should Facebook be allowed in school? I think so. What do you think?

Article about why schools should learn to use Facebook instead of banning them.