As 2013 kicks off, YouTube is taking a look back at some of the most popular, trending videos of last year.  To celebrate 2012 in video, YouTube Trending has released a Best of 2012 list—a list of 12 categories of top 10 video lists, from science videos to sport videos, DIY, music covers, comedy, pets, beauty, gaming, holidays, politics and more.

YouTube Trends manager Kevin Allocca writes, “As we officially start a new year of trending videos in 2013, let’s take a look back at the most-popuar and top trending videos across a wide variety of interesting YouTube categories that helped make 2012 the year that it was!”

We’ve compiled a list of the number one, top videos in each category.  Click on the headings to view the full playlists.  What was your favorite video of 2012? Feel free to share it with us in the comments below!

Top 10 Trending Science Videos of 2012

Top Trending Sports Videos of 2012

Top 10 How-to and DIY Videos of 2012

Top 10 Eye-Popping Videos of 2012

Top 10 Cover Videos of 2012

Top 10 Awe-Inspiring Videos of 2012

Top Trending Beauty Videos of 2012

Top Trending Comedy Videos of 2012

Top 10 Pet Videos of 2012

Top 10 Political Videos of 2012

Top 10 Gaming Culture Videos of 2012

Top 10 Holiday Videos of 2012

Image credit: BortN66 via shutterstock.com

Megan O’Neill is the resident web video expert here at Social Times.  Megan covers everything from the latest viral videos to online video news and tips, and has a passion for bizarre, original and revolutionary content and ideas.