RSS and Online News Readership: a perfect tautology

From Steve, a perfect example of a tautology: "RSS users are significantly more engaged in online news than non-users, visiting an average of 10.6 news sites compared with 3.4 news sites for non-users." (from Nielsen//NetRatings) The hyping of technology aside, what does this mean for the public discourse? I'm a little startled that the average online citizen visits 3.4 news sites. In a world where, before Tim Berners-Lee, people used to be wed for life to one newspaper, 3.4 should indicate a broadening interest in the affairs of business, the state and the community. Or are all those sites of similar political and philosophical bent - only reinforcing existing preconceptions and perceptions?