Christopher Gunn, a dude from beautiful Biloxi, Mississippi, has been posing as Justin Beiber online. Then, using this persona, he would chat up girls in the 9-16 age ranges. When they responded he would depand nude pictures and would threaten to tell their parents if they did not comply.
This isn't the first time this has happened. Just last month, some moron in NJ got in trouble for doing the same thing.
Check out the article here: ArsTechnica