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The 8 most popular YouTube personalities

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With three popular YouTube personalities set to interview President Obama on Jan. 22, two days after his State of the Union, YouTube is the soapbox of the world and "YouTubers" are the ones standing on the soapbox, redefining the word "celebrity."

With three popular YouTube personalities set to interview President Obama on Jan. 22, two days after his State of the Union, YouTube is the soapbox of the world and “YouTubers” are the ones standing on the soapbox, redefining the word “celebrity.”

Grigory Bruev, ©istockphoto.com/bruev

With three popular YouTube personalities set to interview President Obama today, two days after his State of the Union address, YouTube is the soapbox of the world and "YouTubers" are the ones standing on the soapbox, redefining what it means to be a celebrity.

As reported by Mashable and CNN, YouTube superstars Hank Green, Bethany Mota and GloZell Green will sit down with Obama at the White House and grill him with questions submitted via Twitter.

With questions submitted using the hashtag #YouTubeAsksObama, the trio of YouTubers will ask Obama some of the questions submitted. His responses will be live-streamed on YouTube.

In honor of the event and with research from Variety and Common Sense Media, here are the eight most popular YouTube personalities.

1. Bethany Mota

Subscribers: 8,110,041

What you need to know: Mota, a 19-year-old California girl, has garnered a devoted following on her channel talking about various topics that girls love, including fashion, makeup, party ideas and her favorite DIY projects. Mota's popularity has helped her get her own clothing line with young adult and teen retailer Aeropostale, she has a second channel, BethanysLife and she's recorded a single, "Need You Right Now."

2. Michelle Phan

Subscribers: 7,410,000

What you need to know: 27-year-old Phan of Boston has revolutionized the YouTube universe with her makeup tutorials and lifestyle videos , ranging from how to do Lady Gaga makeup to tips on taking the perfect selfie. Like Mota, Phan's Internet fame has propelled her to collaborate with major companies, and she is the official online makeup artist for Lancôme and has her own cosmetic line, Em-Cosmetics. She has also launched another YouTube channel for discovering talent, FAWN, and a beauty social networking website called Ipsy.com.

3. Ryan Higa

Subscribers: 13,623,481

What you need to know: Subscribers to the 24-year-old Hawaiian native's channel, nigahiga, love his random assortment of videos with topics ranging from first-world problems to tips on doing a basketball trick shot. Higa, who studied film at the University of Nevada, Las Vegas, and has a black belt in Judo, has a second channel called HigaTV.

4. Hank and John Green

Subscribers: 2,444,310

What you need to know: The Green brothers and their popular YouTube channel, vlogbrothers, have gained a nice following thanks to their random "vlogs" about anything that is going on in their lives. Hank is a YouTube star and John is a New York Times best-selling author who is most known for his young adult novel-turned-blockbuster "The Fault In Our Stars." The duo's fans, the "Nerdfighters," also enjoy seeing their bespectacled faces on their other channels, including their educational channel, Crash Course.

5. The Fine Bros.

Subscribers: 11,249,621

What you need to know: New York-raised and Los Angeles-based brothers Benny and Rafi Fine have made their YouTube channel, TheFineBros , into a massive business, and they have created content for major companies like Warner Bros. and MTV. Their popular "Kids React" video series won a Daytime Emmy for "Best Viral Series" in 2012, and their REACT YouTube channel also features a "Teens React" and "Elders React" video series.

6. Zoe Sugg

Subscribers: 7,098,632

What you need to know: Like Bethany Mota, British star Zoe Sugg talks about fashion and gives hair and makeup tutorials along with life advice and good girl talk on her main channel, Zoella, and her second channel, MoreZoella. But Sugg isn't just about makeup and dating advice, though, and the YouTube personality's first novel, "Girl Online," came out last November.

7. Miranda Sings

Subscribers: 3,166,940

What you need to know: With her messy red lipstick, side smirk and distinct voice, Miranda Sings (played by Colleen Ballinger) has made people laugh on her channel with her music video parodies, her own comedy versions of fashion and makeup tutorials and silly advice videos on topics ranging from how to take a selfie to how to sing like Ariana Grande. Sings has collaborated with Jerry Seinfeld and was featured on “The Tonight Show with Jimmy Fallon” in December.

8. Lindsey Stirling