I know I've seen studies that back this up. Though at the moment I'm only finding evidence that points in that direction. The largest demographic in internet usage would be described as young, college educated, relatively well off, urban or suburbanite. They also are more likely to live in a "blue" state. High Internet penetration can be found along both the Atlantic and Pacific coasts, as well as in the Rocky Mountain States. Meanwhile, in the interior of the country, especially in the Midwest and the South, Internet use lags greatly behind the national average. I'll hazard that people who are in this group are probably more likely to self identify as liberal than conservative. (these statistics come from a Pew Research web site) That is of course not to say that people who do not fit this demographic never use the internet or that all people who do fit this demographic are also liberal- they just are not the majority. I'll see if I can find something more definitive.
Also I'm sure that this will change. People who use the internet today, I think, are still considered to be "early adopters". Once more people begin using the internet and it becomes as ubiquitous as television, the internet community will be much more likely to have the same demographic as the actual community. People will just gravitate to different sites as they gravitate to different tv programming.




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