There have been a couple of HN discussion threads regarding your last two questions. 1. http://news.ycombinator.com/item?id=3177815 http://news.ycombinator.com

There have been a couple of HN discussion threads regarding your last two questions. 1. http://news.ycombinator.com/item?id=3177815 http://news.ycombinator.com/item?id=3177815 2. http://news.ycombinator.com/item?id=966716 http://news.ycombinator.com/item?id=966716