This Practice Note is a ‘how to’ guide on managing defamatory social media posts. It includes a summary of what defamation is, the laws that apply in Ireland, and the measures and steps to take if dealing with a defamatory post.What laws apply to defamation?Defamation is primarily governed by the Defamation Act 2009 (Ireland) (DA 2009 (IRL)), as amended by the Defamation (Amendment) Act 2026 (Ireland) (D(A)A 2026 (IRL)). It must be viewed in the constitutional balancing act of a citizen’s protected right to a good name against the constitutional guarantee of free expression.The European framework governing intermediary liability was originally implemented in Ireland through the SI No 68/2003 European Communities (Directive 2000/31/EC) Regulations 2003 (Ireland). Where defamatory material is published online, the EU Digital Services Act, Regulation (EU) 2022/2065 (EU DSA) (implemented in Ireland via the Digital Services Act 2024 (Ireland)) also applies to intermediary service providers such as social-media platforms and website hosts.For further guidance on the EU DSA more generally,