Up until last week, "One Direction Infection," a Tumblr blog created and maintained by an eighth grader we'll call Claire, looked like any other 14-year-old's Tumblr: a bright pink background, a default font that resembles cute handwriting, an embedded MP3 player playing Daddy Yankee and Jesse McCartney, and scores of photographs and animated GIFs of the members of One Direction, Britain's biggest boy band.