Spotify's 'Tastebuds' feature lets you find new music by creeping on your friends

App researcher Jane Manchun Wong (@wongmjane on Twitter) is out with her latest discovery of an as-yet-unreleased feature of another popular mobile app, this time regarding a new social feature being tested at Spotify. The new feature is called "Tastebuds," and it would be a step toward Spotify getting back into the social game after the music streaming app experimented with earlier features that connected users to their friends, but then shifted to letting playlists be the main way users discov...