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According to Duolingo, which is the brainchild of the inventor of reCaptcha Luis von Ahn "Since its launch 15 months ago, Duolingo has reached 10 million students and become the most popular way to learn languages online. No ad campaign, no gimmicks; just your support and a mission of free language education for the world." See also http://en.wikipedia.org/wiki/Duolingo

Worth checking for a pretty nifty way to learn a language. Lots of interactivity; personalised; and with absolutely no explanations. For how it works and its business model see this 16 minute talk by its inventor https://www.solveforx.com/moonshots/massive-scale-online-collaboration.