Spotify, looking to build out the social features of its on-demand music streaming service, launched a new Follow button for artists, labels, concert organizers, and anybody else with music to promote. The button can be added to any external website or blog to raise awareness of a specific spotify profile. On click, signed-in Spotify users who are already logged in will automatically follow the artist; if they’re not logged in, they’ll log in and thereafter follow the artist. In following, Spotify users will get an update whenever new tracks or albums are added to the artist’s profile. It’s a very visible play to increase Spotify’s presence across the web, and the button will likely sit next to all the requisite Facebook, Twitter, and Google+ buttons on artists’ pages.