Excellent post by the author who was not looking to use Facebook in a "formal" sense, as a platform to present specific course content. Instead, his goal was to use Fb in an "informal" manner, encouraging each member of the class to see him or herself as a part of the whole
Course Smart is a great site for students looking to find a textbook in eBook format. This site is geared toward higher ed students and they can browse by category and top content.
Survey of 939 professors indicates their use of social media - both personally and in the classroom - is higher than expected with negligible differences found in use by age of professor.