Therefore, as the uploader, you are awarding the social networking site rights to redistribute and use the material.
If the file is your own intellectual property, then it is your prerogative to do so. However, even if you have created material — such as class notes — it may not be the case that it is actually in your ownership, and so theoretically, you may be infringing copyright by sharing such files across the site.
More:
http://www.zdnet.com/blog/igeneration/students-file-sharing-work-on-facebook-is-it-legal/15067
