1D week on Tumblr! storyboard:

Meet the Directioners: The Superfans of One Direction

In case you’ve been living under a rock these past few months, One Direction is the UK boyband that’s taken the world by storm: discovered on The X Factor, hand-picked by Simon Cowell, and with an album that debuted at No. 1 on the U.S. charts (a feat not even the Beatles accomplished). They are one band, made up of five boys, and yet there are nearly half a million Tumblr blogs devoted to their every move. So what does it take to be a One Direction superfan? What is it about these boys from small towns in Britain (and one in Ireland) — Harry Styles, Louis Tomlinson, Niall Horan, Zayn Malik, and Liam Payne — that drives so many girls wild? Every day this week, Storyboard will delve into the depths of teen hysteria to find out. (Plus we got an interview with the band.) Stay tuned, and check out what the fans are saying in the 1D tag — or on the official One Direction Tour Tumblr.

— Video produced by Jessica Bennett and Sky Dylan-Robbins. Published in partnership with MTV News.