An interesting article about how for many websites, it's actually illegal to read them if you are under 13 or under 18 due to COPPA (shows a fundamental problem in the law and how terms of service work)
A discussion of using Facebook in a college classroom
"Moreover, the students essentially ran the group. Although I wrote posts and comments, students wrote over 90 percent of the posts and over 80 percent of the comments. These included everything from asking for notes, getting clarification on points made in lecture, posting videos and images that pertained to class material, forming study groups, noting relevant events on campus, and congratulating class members on specific accomplishments. Sometimes these posts were made during class, right after I discussed something. I thought that this behavior would bother me, but it simply added to the value of the group and reinforced the spontaneity of interaction."
This is a good resource for finding multimedia content that is available to use without needing to get someone's permission for their intellectual property