What is the worlds most popular energy drink?

In the year 2007, heading into the year 2008, Red Bull was the most sold energy drink in the United States (94 million cans), and the World (149 million cans). Monster was the second most purchased energy drink in the World (113 million cans), while being the third most purchased energy drink in the United States (32 million cans). Rockstar was the third most purchased energy drink in the World (62 million cans), while being the fifth most popular energy drink in the United States (37 million cans).

www.facts.com