>5% different, almost everyone is online. We at best get 70% participation in voter representation. Online wise, I'd wager we get at best 20% "public" particip

>5% different, almost everyone is online. We at best get 70% participation in voter representation. Online wise, I'd wager we get at best 20% "public" participation in terms of who bothers to participate online as opposed to lurking. And that 20% is spread amongst hundreds of subjects. And we know these aren't created equal. The internet is disproportionately on the younger side, is very slightly biased by "middle class", educated workers, and the gender demographics vary site to site, despite being overall even (e.g. disproportionately male on Reddit, female on Pintrest). There will definitely be a different resuts online compared to making physical surveys.