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Justin Bieber, The Weeknd, Kate Upton

Getty Images; WireImage

Never say never!

Before Justin Bieber was chilling by the fire eating fondue, he was just an adorable, aspiring singer who posted covers of Chris Brown and Justin Timberlake on YouTube. Flash-forward almost a decade later and he's selling out arenas and posing in steamy Calvin Klein ads!

Get ready for the premiere of Hashtaggers, E!'s first scripted, digital series, by taking a look at more celebrities, including The Weeknd and Kate Upton, who launched their careers on social media!

Watch Hashtaggers when it premieres Feb. 8 on E! Online!