Internet leads as news source ... or does it?

A new report from polling firm Zogby International has troubling signals for conventional media of all types:

70% of Americans think journalism is important to the quality of life in their communities.
67% think traditional journalism is out of touch with what Americans want from their news.
32% said Internet sites are their most trusted source for news and information.
22% said newspapers are the most trusted.
21% said television is the most trusted.
15% said radio is the most trusted.

But I'm not seeing any discussion of the survey methodology, which is troubling: "A sampling of Zogby International's online panel, which is representative of the adult population of the US, was invited to participate." This is not a conventional survey of the general population, but rather an online poll that's been weighted to adjust for the respondents' "region, party, age, race, religion, gender." I would not be taking this one to the bank on the issue of media preference.