What's Trending in 2012: EW Exclusive | EW.com

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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 narrow 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.

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