If you WANT to be published, you will have to make sure your topic is not preempted. A preemption check is not required for the Social Media Class.
LOOK AT LAW REVIEW articles:
When you have at least a general idea for a topic, search law review articles to see what has been written recently. Your paper should cite to some law review articles.
News and Blogs - Helpful for Topic Selection
Blogs
Suggested searches of case law databases on Lexis or Westlaw: