If I were to say that the Chinese take more selfies than any other nation, someone would certainly point out that there are more Chinese than other nationalities in the world, so this is almost certainly going to be true. But it is more than that.
The Chinese seem to take more selfies per capita than the next ten nations put together. There is even an industry of selfie sticks: you can buy them from street vendors almost anywhere. At least in one place, the Olympic stadium in Beijing, I saw a person hiring them out. You pay a deposit equal to the price of the stick, and then when you bring back the stick you get some money back.