This was the only aspect that threw me off from thinking it was real.
IN EARLY SEPTEMBER, MATTHEW FOREMSKI, the 18-year-old son of a Silicon Valley tech reporter, dug up an old version of Rose's MySpace page. She'd deleted it when she became Bree, but Google cached a copy, and Foremski posted the link to his father's blog. Within 48 hours, The New York Times, the Los Angeles Times, and a slew of TV stations ran the story. The jig was up.
So lonelygirl seems to not only be his story, but also his obsession. It is like the characters people create in MUDs and then they become obsessed with them.