From Axl Rose To Justin Bieber: The Top-10 Twitter Feuds

Justin Bieber vs Online Enemy: With an army of over 5 millions Twitter followers, it's best not to upset teen sensation Justin Bieber, as he proved earlier this year when he posted the phone number of an enemy on the social-networking site. As a result, Kevin Kristopik found himself the unwilling recipient of thousands of phone calls and messages from Bieber's Beliebers.

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