It must have started when I realized the improbability of Harry Styles halo of hair. Or it may have started when the 5 part harmonies of boy angels hit just the right notes in Story of My Life. Or it may have started much earlier than even I remember, maybe somewhere between 1999 and 2005. Regardless, I now call myself a fan of the little known band One Direction.
It is not the origins of this passion that matters but more what I found in the way of tumblr fandom. This medium opened both a community, a goddamn pit of a time suck, and a lot of realizations about the importance of diversifying your media.