At this point, internet starlet Lonelygirl15 should need no introduction, least of all to net-savvy Joystiq readers. But if you've been asleep all summer, here's a brief intro: Lonelygirl15's Youtube videos have garnered over 18 million views. She's the second-most subscribed-to channel of all time on Youtube, and she's crazy cute to boot.
But she's not real. In fact, but she may be part of an alternate reality game (ARG).