Nope, it's just that for the US, for example, Amazon and Facebook have almost identical valuations so they're on top of each other.
"Roll over the interactive chart above to see the company and value. If all three datapoints are not visible, it is because one is shrouded by another (ie, America's Amazon obscures Facebook, since both are worth around $185 billion); clicking on the key at the top will remove datapoints."
Looks like there are only two internet companies in USA
There's like half a pixel you can hover over to the left of Amazon which shows Facebook.