General Resources - United States

Country
Center for Democracy & Technology, Intermediary Liability, https://cdt.org/issue/free-expression/intermediary-liability 
Electronic Frontier Foundation, https://www.eff.org
Eric Goldman's Technology and Marketing Law Blog, blog.ericgoldman.org including a discussion of all Section 230 cases so far decided
Stanford CIS, Intermediary Liability, https://cyberlaw.stanford.edu/focus-areas/intermediary-liability  
The Takedown Project, http://takedownproject.org/
Country
Topic, claim, or defense
General or Non-Specified