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  1. en.wikipedia.org › wiki › DuolingoDuolingo - Wikipedia

    1 day ago · Language, music, and mathematics courses and language assessment. Duolingo, Inc., [b] is an American educational technology company that produces learning apps and provides language certification. Duolingo offers courses on music, [5] math, [6] and 43 languages, [7] ranging from English, French, and Spanish to less commonly studied languages ...

  2. en.wikipedia.org › wiki › WeChatWeChat - Wikipedia

    1 day ago · The original version of the app was created by Allen Zhang, named "Weixin" (微信) by Pony Ma, [27] and launched in 2011. The user adoption of WeChat was initially very slow, with users wondering why key features were missing; however, after the release of the Walkie-talkie -like voice messaging feature in May of that year, growth surged. [ 25 ]

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