One of Justin Bieber's Tweets in January 2012 had over 92,000 ReTweets

"On the 10th of January, 2012, Justin Bieber retweeted one of Floyd Mayweather’s tweets (@FloydMayweather Manny Pacquiao I'm calling you out let's fight May 5th and give the world what they want to see). This tweet went on to receive 92,314 Retweets! Now that’s evidence of the Bieber-bump in action."

Source:  Blog post by TwitSprout, 1st February 2012

Follow the link for data on retweets for the top 10 most-followed