How many continents are there?

Most of us that grew up in an anglophone country were taught in school that the world has 7 continents. We dutifully memorized them and that was that. However, in Guatemala and in many other (especially Latin American) countries around the world, school children learn that there are 6 continents (America being one continent rather than split into North and South). If nothing else and interesting topic of conversation when meeting new friends.