It is more than a suspicion, although the number of studies is fairly low: reading news online is not the same as reading news in print. In particular, people who read news online are less likely to read top news stories. What counts online is presenting the latest news, no matter how unimportant it may be in the long run. The front page of the New York Times online changes more often than the front page of the New York Times print edition.
But it is more than that. In the print edition, topics and areas are pre-ordered, by the editors. Politics is first. With the online edition, you can navigate away from politics to sports with a single mouse click. No more leafing through pages and pages of news. News related to lifestyle (health, arts and style) are now presented on the same level as international news. What concerns you personally is as important as what concerns the world as a whole.