The Year According to Twitter: 2011's Top Tweets

Dec. 1, 2011— -- More than 100 million people around the world log in to Twitter every day to tweet about everything from their daily commutes to the meals they eat -- but many have used the social networking tool this year for something much more important: share important events with people who could be thousands of miles away.

Every year, Twitter compiles a year-in-review to recap what the company believes were the most important tweets. They highlight the "best" according to the level of "impact, resonance, and relevance," and take into account the big stories that first broke on Twitter -- not by news agencies -- but by people looking to share a photo, a thought, or a moment in time with people they may never meet.

"World News with Diane Sawyer" sat down with Twitter co-founder Jack Dorsey to go over this year's list: