Who were the year's biggest breakout stars online? Shira Lazar fills us in -VIDEO EXCLUSIVE

What’s Trending host Shira Lazar knows the web. She’s interviewed the biggest YouTube stars and everyday on the show counts down the top five trending viral videos on YouTube. So who better to┬ánarrow down the year’s most popular online trending topics, exclusively for EW. Check out her picks, from Jimmy Kimmel’s videos to the McKayla is Not Impressed Tumblr, below, and on YouTube (of course!) by clicking here.

For more What’s Trending, check out the daily show, live at 3 p.m. ET daily on YouTube.

Read more:
Best of 2012: The year in lyrics, from Taylor Swift to Carly Rae
iTunes reveals top-selling music, movies, TV, books, and apps of 2012
Special coverage: Best and Worst 2012

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