An election victory tweet from President Barack Obama -- "Four more years" with a picture of him hugging his wife -- was the most retweeted ever.
Caption: President Barack Obama hugs first lady, Michelle Obama, after she introduces him at a campaign event at the Village of East Davenport in Davenport, Iowa, August 15, 2012. REUTERS/Larry Downing
Obama, Justin Bieber and Green Bay Packers' TJ Lang have garnered the highest number of retweets this year.