Top 10 biggest amazon's acquisitions in its history

These are the The top 10 Amazon's Acquisition. 

In 2014 Amazon bough Twitch ( video gaming streaming website )or an estimated  $970million dollars . However for Amazon " Zappos the online shoe store was its biggest cue   as ' it stole the thunder from other competitors "zappos is known for its almost fanatical customer care  quality and attention to the smallest detail when it came to servicing its customers . Zappos has been amazon's most expensive buyout in the history of the company.

Some other Amazon buyout includes
 Kiva Systems, $775 million, warehouse robot systems in 2012.
Exchange.com, $645 million, online book marketplace in 1999
Quidsi, $545 million, online retailer in  2010.