This year's YouTube was full of hilarious and exciting videos that instantly went viral. The website recently released its annual list of top trending videos of 2013.

The Norwegian comedy duo Ylvis's video "What Does the Fox Say?" leads this year's list with its massive 276 million views since it was posted in September. Another Norwegian video -- "Harlem Shake (Original Army Edition)" by kennethaakonsen -- the Norwegian Army version of the Harlem Shake dance craze came in right behind Ylvis's video as the most popular video of the 1.7 million versions of the dance that were uploaded to YouTube.

PSY's "Gentleman" came in No. 1 on the top trending music video list with 598 million views since it was uploaded in April. Both of twerking pop star Miley Cyrus' music videos, "Wrecking Ball" and "We Can't Stop" placed the second and third on the list, respectively.

Katy Perry's "Roar" and P!nk's "Just Give Me a Reason" featuring Nate Ruess finished the top five list, while Robin Thicke's summer hit "Blurred Lines" came in the sixth.

Overall, according to the statistics, YouTube claimed that 1 billion users watch 6 billion hours of content on its site every month, which the vast majority of those view come from outside of the United States.

The site also compiled a video tribute to 2013, YouTube Rewind: What Does 2013 Say? -- a clever mashup of some of this year's most popular moments to recap.

Here are the top 10 trending videos of this year:

  1. Ylvis - "The Fox (What Does the Fox Say)" by tvnorge
  2. "Harlem Shake (Original Army Edition)" by kennethaakonsen
  3. "How Animals Eat Their Food" / MisterEpicMann by MisterEpicMann
  4. Miley Cyrus - "Wrecking Ball (Chatroulette Version)" by SteveKardynal
  5. baby&me / the new evian film by EvianBabies
  6. Volvo Trucks - "The Epic Split" feat. Van Damme by VolvoTrucks
  7. "YOLO" (feat. Adam Levine & Kendrick Lamar) by thelonelyisland
  8. Telekinetic Coffee Shop Surprise by CarrieNYC
  9. THE NFL: A Bad Lip Reading by BadLipReading
  10. Mozart vs Skrillex. Epic Rap Battles of History Season 2 by ERB

And check out the top 10 trending music videos of 2013:

  1. PSY - "GENTLEMAN M/V" by officialpsy
  2. Miley Cyrus - "Wrecking Ball" by MileyCyrusVEVO
  3. Miley Cyrus - "We Can't Stop" by MileyCyrusVEVO
  4. Katy Perry - "Roar (Official)" - KatyPerryVEVO
  5. P!nk - "Just Give Me A Reason" ft. Nate Ruess by PinkVEVO
  6. Robin Thicke - "Blurred Lines" ft. T.I., Pharrell by RobinThickeVEVO
  7. Rihanna - "Stay" ft. Mikky Ekko by RihannaVEVO
  8. Naughty Boy - "La La La" ft. Sam Smith by NaughtyBoyVEVO
  9. Selena Gomez - "Come & Get It" by SelenaGomezVEVO
  10. Avicii - "Wake Me Up (Official Video)" by AviciiOfficialVEVO