The MBTI® is a personality test developed by Isabel Myers and Katherine Briggs in the 1940s. MBTI® and Myers-Briggs Type Indicator® are trademarks of CPP, Inc.
ESTJ seeks INFP: Looking for love through personality tests - "Indeed, the thumbnail descriptors are so eerily accurate it's no surprise that they've found new life in the online-personals ads. The evidence is plentiful, from mentions in Match.com profiles ("thoughtful ISTJ seeks similar") to entire dating sites, such as TypeTango.com and JungDate.com, designed in large part around the Myers-Briggs."