Under common law, to constitute defamation, a claim must generally be false and must have been made to someone other than the person defamed. Some common law jurisdictions also distinguish between spoken defamation, called slander, and defamation in other media such as printed words or images, called libel.
False light laws protect against statements which are not technically false, but which are misleading.
As of 2017, at least 130 UNESCO Member States retained criminal defamation laws. In 2017, the Organization for Security and Cooperation in Europe (OSCE) Office of the Representative on Freedom of the Media issued a report on criminal defamation and anti-blasphemy laws among its Member States, which found that defamation is criminalized in nearly three-quarters (42) of the 57 OSCE participating States. Many of the laws pertaining to defamation include specific provisions for harsher punishment for speech or publications critical of heads of state, public officials, state bodies and the State itself. The OSCE report also noted that blasphemy and religious insult laws exist in around one third of OSCE participating States; many of these combine blasphemy and/or religious insult with elements of hate speech legislation.
Countries in every region have moved to advance the criminalization of defamation by extending legislation to online content. Cybercrime and anti-terrorism laws passed throughout the world have led to bloggers appearing before courts, with some serving time in prison. The United Nations, OSCE, Organisation of American States (OAS) and African Commission on Human and Peoples’ Rights Special Rapporteurs for Freedom of Expression stated in a joint declaration in March 2017 that ‘general prohibitions on the dissemination of information based on vague and ambiguous ideas, including “false news” or “non-objective information”, are incompatible with international standards for restrictions on freedom of expression...and should be abolished.’