When can you ask (or threaten) an online publication to remove materials?

singapore freedom of speech online publication laws defamation national security censorship personal data protection privacy

I run several online magazines and every once in a while, some displeased individual would write to me and request for a video/photograph/article to be taken down. Threats range from defamation to privacy, annoyingly often misapplying the Personal Data Protection Act.  I have refused each one of these requests. For me, a good starting point is the …