Also been discussed here: http://news.ycombinator.com/item?id=767380 http://news.ycombinator.com/item?id=767380 and here http://news.ycombinator.com/item?id=780

Also been discussed here: http://news.ycombinator.com/item?id=767380 http://news.ycombinator.com/item?id=767380 and here http://news.ycombinator.com/item?id=780647 http://news.ycombinator.com/item?id=780647