From what you've said, it sounds like SF and the Bay Area may be more of an exception than the rule for the US as a whole. My only experience with it is one trip to Santa Clara, so SF is not what I'm basing my opinion…
your site is using nicescroll (http://areaaperta.com/nicescroll/) to create a custom scroll bar/scroll effects instead of allowing the browser to handle scrolling itself.
From what you've said, it sounds like SF and the Bay Area may be more of an exception than the rule for the US as a whole. My only experience with it is one trip to Santa Clara, so SF is not what I'm basing my opinion…
your site is using nicescroll (http://areaaperta.com/nicescroll/) to create a custom scroll bar/scroll effects instead of allowing the browser to handle scrolling itself.