Ideologies online

In what I found to be an interesting op-ed from the New York Times, the author asked whether liberal people would contain their internet use to liberal sites and conservatives would contain their use to conservative sites.  I would have suspected that the answer to this question would have been yes, but the quoted study suggested that the answer might in fact be no.  Perhaps I should have realized this; I know that even though I am liberal, I have clicked over to Fox News, etc. to see other perspectives, but I thought that this was less common than it perhaps is.  Are there news sites that you recommend for their balance?