Beliebers Celebrate 9 Years of Justin Bieber Since YouTube Debut

 Chris McKay/WireImage

Justin Bieber performs during Power 96.1's Jingle Ball 2015 at Philips Arena on Dec. 17, 2015 in Atlanta, Ga. 

Beliebers are taking to Twitter to praise the day that Justin Bieber made his YouTube debut with the hashtag #9YearsofKidRauhl. 

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The hashtag is a throwback reference to Bieber’s YouTube channel, named after his dad’s interest in a series of fantasy novels. Fans online are using this to commemorate his transformation from YouTube child sensation to thrill-seeking pop chart-topper. 

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Read a few of the Twitter reactions below. Revisit Justin's 2015 Billboard cover story here