If sharing is caring, Muzik ($300) is like the Mother Theresa of headphones. With built-in buttons on the right earphone you can instantly let your Facebook fam’ and Twitter ‘tourage know what tunes you’re digging, or just add a song to your playlist. Right now the headphones work with streaming services Spotify and Rdio, but Muzik’s open architecture will open it up to all sorts of apps in the months to come.