Bracing for Bieber Fever: Inside Justin Mania

You may not know much about 16-year-old singing sensation Justin Bieber — yet. Our plan is to change that Friday night when Chris Connelly (of MTV fame) profiles this teen machine, a talent found the old-fashioned way, on YouTube. Anyone with a Twitter account has experienced how enthusiastic his followers are — his name, or some variation of it — has become a regular on trending lists. So as tickets go on sale for his "My World" tour, we step inside the world of a legitimate teen idol at the moment his fame is starting to skyrocket. Click HERE for a ABCNews.com preview, "10 Things You Didn't Know About Justin Bieber," and HERE for a slideshow of photos from a recent Los Angeles concert. Spread the word — and tune in tomorrow night. As always, will embed the segment after it airs. For now, here's a "GMA Weekend" segment from November that includes the YouTube video that got him his big break.