The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Slums (3 members)
- Social class (8 members)
- Social democracy (1 member)
- Social democratic parties (4 members)
- Social democrats (3 members)
- Social indicators (1 member)
- Social issues (10 members)
- Social media (7 members)
- Socialism (15 members)
- Socialism by country (11 members)
- Socialism in Albania (1 member)
- Socialism in Chile (1 member)
- Socialism in Germany (3 members)
- Socialism in India (2 members)
- Socialism in Ireland (1 member)
- Socialism in Japan (1 member)
- Socialism in Norway (1 member)
- Socialism in Poland (1 member)
- Socialism in the Netherlands (1 member)
- Socialism in the United States (7 members)
- Socialist Space Programs (1 member)
- Socialist art (2 members)
- Socialist intelligence agencies (4 members)
- Socialist leaders (2 members)
- Socialist media outlets (17 members)
- Socialist newspapers (22 members)
- Socialist podcasts (17 members)
- Socialist political parties (10 members)
- Socialist realism (3 members)
- Socialist rulers (8 members)
- Socialist states (7 members)
- Socialists (18 members)
- Socialists by nationality (3 members)
- Sociology (2 members)
- Software (4 members)
- Soldiers (2 members)
- Solzhenitsyn family (1 member)
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- Soviet Union (4 members)
- Soviet Union navigational boxes (1 member)
- Soviet Union portal (3 members)
- Soviet agronomists (1 member)
- Soviet anti-USA posters (6 members)
- Soviet anti-fascist posters (1 member)
- Soviet military personnel of the Russian Civil War (1 member)
- Soviet military personnel of the Spanish Civil War (1 member)
- Soviet politicians (17 members)
- Soviet propaganda posters (37 members)
- Space Programs (1 member)
- Speeches (12 members)
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- Spies (1 member)
- Sports (2 members)
- State bodies (2 members)
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- State ideologies (3 members)
- State media (6 members)
- State media of anti-imperialist countries (4 members)
- State media of imperialist countries (0 members)
- State media of socialist countries (1 member)
- States (4 members)
- States of India (1 member)
- Statesian Marxists (5 members)
- Statesian anti-communists (1 member)
- Statesian communist parties (14 members)
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- Statesian historians (1 member)
- Statesian journalists (6 members)
- Statesian political prisoners (16 members)
- Statesian politicians (9 members)
- Statesian slave owners (9 members)
- Statesians by descent (9 members)
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- Statesians of Irish descent (4 members)
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- Statues (9 members)
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- Stubs (382 members)
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- Suppression of dissent (11 members)
- Tanzania (1 member)
- Targets of bourgeois media (12 members)
- Targets of censorship (24 members)
- Targets of corporate media attacks (0 members)
- Targets of imperialism (8 members)
- Targets of intelligence operations (15 members)
- Targets of regime change operations (12 members)