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Type of site
Social Learning, Language Learning, General Learning
Available in Includes Japanese, Korean, English
Created by Cerego Japan, Inc.
Key people Paul Greenberg, CEO; Andrew Smith Lewis, Chairman
Commercial Yes
Registration Free
Current status Closed (formerly iKnow!) was a social learning- and community website created by Cerego Japan, Inc. The website used spaced repetition algorithms (SRS) to assist users in committing facts to long term memory and increasing learning speed. Users could create, manage and share lists of facts to memorize; as well as learn a number of languages.[1] Progress could be monitored with tests.[2] The data was used to automatically plan a curriculum and learning strategy for the users.[3][4] In addition to the website base, also had a Facebook application.

History[edit] was created by Japan-based company Cerego Japan, Inc., initially featuring language-learning and branded under the name iKnow! ( The original platform focused on English learners in Japan and attracted roughly 300,000 users in its first year.[5] On November 24, 2008 the platform turned to world-wide audience when it added another 188 languages. The upgrade also included tools for users to create learning content; sample sentences and timed tests. Cerego had raised US$20 million in funding at the time and was staffed by 22 employees.[1][6]

The site's name was changed to on March 5, 2009 when the platform introduced an upgrade which enabled users to add learning content of any kind. The re-branding was sudden, and users complained about the new interface and new name.[citation needed] About the new name, Cerego's Russell Moench explained in an official announcement: "we see ourselves more like your personal learning station than an online classroom or teacher or textbook."[7]


Cerego's used spaced repetition techniques to assist users in organizing learning content, increase learning speed and improve recollection. The system was based on established methods of learning derived from cognitive- and neuroscience research; continuously analyzing performance, on a long- and short-term basis, making dynamic adjustments to learning exercises. The data was used to automatically plan a curriculum and learning strategy for the users.[3][4]


On January 27, 2011, Cerego Japan, Inc. announced the planned closure of the free service for March 31, 2011. The service has since been replaced with Cerego's paid subscription-based language learning site, iKnow![8]


  1. ^ a b Anthony Ha (2009-09-07). "’s Facebook app may be smarter than you think". Retrieved 2009-09-27. 
  2. ^, accessed 3/25/2009
  3. ^ a b Serkan Toto (2008-10-15). "iKnow Is A Social Learning Platform That Can Really Make You Smarter. Opens API.". Retrieved 2009-09-22. 
  4. ^ a b Leena Rao (2009-09-10). "Cerego Raises $3.4 Million For, Launches Facebook Friend Quiz". Retrieved 2009-09-22. 
  5. ^ "Cerego Japan Inc.". CrunchBase. 2009-09-17. Retrieved 2009-09-27. 
  6. ^ Dean Takahashi (2008-11-24). "Cerego releases iKnow! social language learning platform". Retrieved 2009-09-27. 
  7. ^ Russell Moench (2009-03-04). "Hi there. We're". weblog. Retrieved 2009-03-19. 
  8. ^ (2011-01-27). "Closing the Service". Retrieved 2011-01-27.