When American population just sits at home watching TV or playing video games, Europeans and especially Dutch tend to spend time together. Sit at cafes getting high, eat at a restaurant and have some fine wine, and socialize with people. The same is true for Asians and Australians too. And the American people introvert culture isn't a new thing that came with computers - they did this before geeks too. Sitting in front of TV watching mindless shows and eating TV dinners, alone.
One great geeky example about Americans making artificial social walls around them is how quick companies were to replace LAN gaming with online gaming so that you could sit alone and not interact with people. I live in asia and when people play games, they go play them with friends to internet cafes. There's a place near me where there is always young guys gaming together. There's a huge cultural difference between US and the rest of the world.
As the saying goes - "We have the technology, we can build anti-social walls around us!"