It's fitting that Valentine's Day this year also coincides with the 10th anniversary of YouTube, because everyone all over the world loves the video sharing platform. On Feb. 14, 2005, three former Paypal employees activated the YouTube domain name and forever changed the way people consume popular culture. The website has played a huge role in helping artists get noticed (Justin Bieber) and has become the MTV for millennials, with artists often debuting music videos through the site. It's even responsible for spreading cultural phenomenons like Psy's "Gangnam Style."

In celebration of YouTube's milestone, Billboard compiled 10 of the most-viewed videos from the website and the result is a walk right down memory lane.

Psy's "Gangnam Style" dominated the pop culture news realm in 2012 largely thanks to the performer's outrageous video that featured an infectious dance routine. Since July of that year, the video has raked in 2.2 billion views, handily winning the top spot. All the more impressive, Psy also comes in at number 10 on the list with "Gentlemen." It's no where near as popular as his first single, but it still accumulated 796.5 million views in about three years.

Behind Psy is "Baby" by Bieber featuring Ludacris. Legend has it that Biebs was discovered thanks to YouTube. The website has also helped the pop star maintain his busy career. "Baby" was the lead single from his major label debut, My World 2.0. It hit the Internet in 2010 and has been seen 1.1 billion times and counting.

Perhaps the most impressive feat on the list belongs to Katy Perry. Her video for "Dark Horse" debuted in 2014 and it still ranks at number three with more than 820 million views. "Party Rock Anthem" by LMFAO is right behind her with 818.7 million views. Rounding out the top five is the hilarious video "Charlie Bit My Finger - Again!" After being uploaded in 2007, the cute clip has been seen 811 million times.

Here are the rest of the videos on the list:

6. Love the Way You Lie - Eminem featuring Rihanna (811 million)

7. On the Floor - Jennifer Lopex featuring Pitbull (809 million)

8. Waka Waka (This Time for Africa) - Shakira featuring FreshlyGround (806 million)

9. Roar - Katy Perry (800 million)

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