Twitter just released the top two Tweets that generated the most Retweets for 2012.

President Obama and Justin Bieber…

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Before he took the stage to affirm his election victory, President Obama marked his win via Twitter. Within hours, this Tweet simultaneously became the most retweeted of 2012 — and the most retweeted ever, sent by people in more than 200 countries around the world.

Suffering from a rare form of brain cancer, six-year-old Avalanna Routh was big Justin Bieber fan, and the pop star had grown close to her during her illness. When she passed away in September. Bieber paid tribute to her in a Tweet, and many, many Twitter Beliebers responded.