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.

A high IQ society seeking members among scientists at the 99.5 percentile of intelligence (139 IQ/IEQ, SD=15).

A forum for the intellectually highly gifted. Members must have an IQ of at least 132 (M=100; SD=16).

Requires score of 126 on any of five free tests. Members enjoy access to chat rooms, discussion forums, online tournaments in chess, backgammon, contract bridge, and Go, as well as difficult puzzles and brainteasers, and the ability to submit works to the quarterly online magazine.

Society with an entrance requirement at the one in a million level. Its purpose is to provide members with forums and outlets for their ideas.

An organization for highly gifted individuals (99.5 percentile IQ, or the top 0.5% of the general population) who have a love of poetry. Members can submit works for publication in the organization's online journal and interact with fellow poets via a member chat forum, and a message board.

Educational, scientific, and research group for those with extreme intelligence.

TNS is a high-IQ society which selects members at the 99.9th percentile using a number of IQ and academic aptitude tests. Journal: Vidya.