Internet censorship in Singapore is carried out by the Infocomm Media Development Authority (IMDA). Internet services provided by the three major Internet service providers (ISPs) are subject to regulation by the MDA, which requires blocking of a symbolic number of websites containing "mass impact objectionable" material, including Playboy, YouPorn and Ashley Madison.[1] The civil service, tertiary institutions and Institute of Technical Education has its own jurisdiction to block websites displaying pornography, information about drugs and online piracy.