Harry Styles celebrates four years with One Direction

It seems like One Direction have been together forever, but Niall, harry, Zayn, Liam, and Louis only met each other four years ago.

Their journey to superstardom started on April 11, 2010, and Harry Styles celebrated the big day with this tweet:

“Thank you for everything the last 4 years...Couldn't be more  by what you've done for us. H .xx.”

When did you discover One Direction? Did you follow them from the beginning on The X Factor or did you find out about them a little later?