I imagine they don't use bittorrent because it is both very large (TBs) and changes frequently. With S3, you could boot up a bunch of Hadoop processes, pull it

I imagine they don't use bittorrent because it is both very large (TBs) and changes frequently. With S3, you could boot up a bunch of Hadoop processes, pull it (without incurring any bandwidth costs I believe), process it and dump out whatever you want.