I always thought that, by definition, you could only have one "best friend". Because only one could be the best. I also thought that it had to be reciprocal: if you were my best friend then I was yours. Which it is where it can get tricky. But recently I keep reading thing like "the average American has 4 best friends"! So, do you use "best friend" to mean the same as "close friend" and think you can have more than one? Do different understandings of "best friend" lead to confusion?