Some previous threads:

2013 https://news.ycombinator.com/item?id=5639013

2013 https://news.ycombinator.com/item?id=5043667

2012 https://news.ycombinator.com/item?id=3675759

2010 https://news.ycombinator.com/item?id=1419526

2009 https://news.ycombinator.com/item?id=859336