I thought the article was interesting. I realize that students now are so plugged in to social media. I hadn't had my twitter account five minutes when I started being followed by my students. They just know. As educators I think it is important to use technology in classes and in coaching. It is so important though to teach proper use first.
I think that posting assignments and other things on Facebook and Twitter would be very beneficial. You could also use twitter to send homework reminders. I do agree with the article in that there are better platforms to use in education. I really like model. I think it gives the teacher more control over the site. There is no doubt these students today are able to learn better by these methods.