The Next Web writes, Launched in 2008 in Sweden, Spotify has become a national institution. In fact, one-third of Swedes use the service and it now generates more money than iTunes. However, it’s about to get some serious competition, with music streaming rival Rdio opening its doors to Swedish and Finnish music lovers. Word of the launch comes from Rdio intern Chris Masterson, who tweeted the news: Say hello to @Rdio in Sweden and Finland! — Chris Masterson (@chrismasterson) July 3, 2012 As The Verge points out, Rdio has also updated the availability page on its website, adding the Scandanavian and...