Popular EdTech sites, December 2013

last month this month
https://www.coursera.org/  1,865  1,963 -5%
https://www.udemy.com  2,081  1,965 6%
http://quizlet.com/  4,427  3,530 20%
https://www.khanacademy.org/  4,476  4,168 7%
https://www.udacity.com/  7,042  6,705 5%
http://www.coursehero.com/  19,050  15,431 19%
http://learni.st/  26,042  17,779 32%
http://academicearth.org/  59,980  64,008 -7%
http://openstudy.com/  61,018  48,932 20%
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