I counted 21 countries, which I thought is pretty much. But the world is sooo big, and Europe is so small. On the map, it looks pretty few.
Chrissi, I was thinking that too. One click on Canada or the US, and a big red area appears on the map, but a bunch of clicks in Europe or SE Asia don't show much at all. Just wait til someone has been to Russia or China - one click will really redden up the map.