Amazon’s newest tablet, the Kindle Fire, helped increase Kindle Family sales by 4x when compared to the same period last year, and was also the best-selling item at Amazon.com on Black Friday. The boost in sales wasn’t exclusive to Amazon’s online market, with both Best Buy and Target reporting increased demand for the new tablet. From The Next Web:

Nik Nayar, vice president merchandising at Target said that the Kindle Fire was so popular, sales of the device outperformed all other Android devices at its stores: “This was a great Black Friday for Target and for Kindle Fire, which was the bestselling tablet in our stores on Black Friday”

If you are wondering how many Kindle Fires were sold, Amazon will most likely let you down. Not because the number is low, but because they refrain from releasing sales figures. What we do know is that the number before Black Friday was in the millions, with unofficial 2011 sales estimated at five million.