Justin Bieber reached one million followers on Twitter.
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Psy's 'Gangnam Style' music video became the most viewed video on YouTube, passing 800 million views.
The first-ever Tweet was published on Twitter.
Justin Bieber was born in Stratford, Canada.
Twitter was launched to the public.
Justin Bieber posted on Instagram that he has Lyme disease, a bacterial illness spread by ticks.
