Horny Teen Girls! Chile, there was a group of girls in my gym class and all they did was stalk 1D's every move on their phones and iPads. They went crazy screaming in the gym because Niall got his braces off. Oh, and look at Justin Bieber stans/fans, that should be enough to answer your question.
Teen/preteen girls cannot be matched. A large group of hormonal, over emotional teenage girls are terrifying. They could destroy cities. They will stop at nothing for their idol.