DUOLINGO: $20 million to Duolingo in a Series C round led by Kleiner Perkins Caufield & Byers, with existing backers New Enterprise Associates and Union Square Ventures also participating. The Pittsburgh, PA-based startup has now raised $38 million. Since its founding in 2011, Duolingo has skyrocketed in popularity, nabbing awards such as "Education Startup of the Year" at the Crunchies and Apple's coveted "App of the Year." It has over 25 million users and adds about 100,000 new ones everyday. Duolingo currently offers 18 languages and could cover as many as 50 by the end of the year. Also in the works is an online certification program where users would pay $20 to take a language test. Founder Luis von Ahn told Mashable the company may expand beyond its bread-and-butter offering of foreign languages and into other subjects like math and programming.