In Singapore, Internet services provided by the three major Internet service providers (ISPs) are subject to regulation by the Media Development Authority (MDA) to block a "symbolic" number of websites containing "mass impact objectionable" material, including Playboy and YouPorn. In addition, the Ministry of Education of Singapore blocks access to pornographic and to certain "objectionable" internet content on its proxy servers. When trying to access a blocked site, visitors are usually greeted by a MDA message, though the less transparent "404 error" screen may be displayed whereas some of it will have 'Forbidden. Access to the BlueCoat Web Filtering Service was blocked due to the condition: Pornography'. The city state reportedly employs deep packet inspection of internet traffic.
Leading politicians of the ruling People's Action Party and government agencies have been known to use or threaten to use litigation against bloggers and other Internet content providers. The first instance of such activity was against Sintercom in July 2001 when the founder, Dr Tan Chong Kee, was asked to register the website under the nascent Singapore Broadcast Authority Act (now Media Development Authority). Dr Tan chose to shut down Sintercom due to concerns over the ambiguity of the Act. In April 2005, a blogger, Chen Jiahao, then a graduate student at the University of Illinois at Urbana-Champaign, was made to apologise and shut down his blog containing criticisms on government agency A*STAR, after its Chairman Philip Yeo threatened to sue for defamation. In September 2005, three people were arrested and charged under the Sedition Act for posting racist comments on the Internet.  Later, the Teachers' Union announced that it is offering legal assistance to teachers who want to take legal action against students who defame them on their blogs, after five students from Saint Andrew's Junior College were suspended for three days for allegedly "flaming" two teachers and a vice-principal on their blogs.
The Computer Misuse Act (CMA) was introduced in 1993 and its offence provisions are based primarily on the United Kingdom’s 1990 legislation of the same name. In the years since, the government has taken a much tougher stand on Internet-related matters, including censorship. Amendments to the Penal Code in 2006 intend to hold Internet users liable for "causing public mischief", and give the authorities broader powers in regulating Internet content..
The list of websites is kept confidential by the Media Development Authority. Banned sites include pornographic sites, homosexuality-related sites, Malaysian news websites, certain YouTube videos, and sites displaying anti-Islam sentiment. In 2005, MDA banned a gay website and fined another website following complaints that the sites contained offensive content. The banned website is said to have promoted promiscuous sexual behaviour and recruited underage boys for sex and nude photography.
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- Country Reports on Human Rights Practices 2005, United States Department of State, retrieved 20 March 2006.
- "Schools act against students for 'flaming' teachers on blogs", The Straits Times, page 1, 27 September 2005, by Sandra Davie and Liaw Wy-Cin.
- NTUC sacks staff for inappropriate Facebook comments channelnewsasia.com 8 October 2012
- An Overview of Cybercrime Legislation and Cases in Singapore Gregor Urbas, Asian Law Institute (ANU), October 2008
- Mixing welfare and elitism in Singapore By Alex Au, Asia Times Online November 23, 2006
- Consultation Paper on the Proposed Penal Code Amendments, Ministry of Home Affairs, 8 November 2006
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