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Twitter Inc. (NYSE: TWTR) has invested in headphone company Muzik, according to Re/code. While there are several investors in Muzik, this is the first time Twitter has invested in a hardware company. The headphones allow users to share clips of songs that they have listened to on social networks. The TWTR stock price is down 4.24% in early morning trading today (Monday) to start the first day of trading in 2016.