| Prometheus Society - Educational, scientific, and research group for those with extreme intelligence.
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| SesquIQ - High IQ society. Membership active in environmentalism and research.
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| The Cerebrals Society - A society for those whose IQ falls at or above the 99.7th percentile (top 0.3% of the general population). Members interact via discussion forums and an online journal. IQ tests are available on this site.
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| High IQ Society - An online community of intelligent persons.
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| IQuadrivium Society - A high IQ society for those at and above the 99.9th percentile.
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| International High IQ Society - Professional free online IQ tests; you can choose between Flash and HTML version. Membership possible.
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| Intertel - An organization of those with IQ scores in the 99th percentile (top 1% of the general population). The goals of the organization are to encourage meaningful intellectual fellowship, foster an exchange of ideas on any and all subjects, and to assist in research relating to high intelligence.
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| The Intellect-Fellowship - A fellowship for intellectuals in the top 10% of society. The fellowship encourages creativity of members, publication of their works and thoughts, engagement in the functioning of the group and participation in one or more areas related to the fellowship.
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| Pars Society - Seeks to provide a peaceful, intellectual and private forum for its members. Proof of intelligence level at or above +2.5 standard deviations is required for membership.
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| Mega Society - Society with an entrance requirement at the one in a million level, it's purpose is to provide members with forums and outlets for their ideas.
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| Ne Plus Ultra - An intellectually oriented club that seeks to gather exceptionally insightful people to discuss ideas across a variety of domains.
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| High IQ for Humanity - Seeks to develop the skills of gifted children within their respective countries in the hope that they will stay to develop their homeland instead of migrating abroad. News, child profiles, project information, and sponsor list available.
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| Yahoo Groups!: Existentia - Founded on the basis of congregating intelligent and creative individuals to discuss intellectual matters, focusing on the premise of Existential thought.
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| HighPotentialsSociety - Das Forum für hochbegabte Menschen bietet seinen Mitgliedern die Möglichkeit, Ideen und Gefühle mit anderen Hochbegabten auszutauschen. Einziges Kriterium ist ein IQ von mindestens 130.
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| Glia Society - Seeks to be a forum for the intelligent and to encourage intelligence-related research.
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