This and plenty of other interesting ideas here: http://news.ycombinator.com/item?id=2810689 http://news.ycombinator.com/item?id=2810689 and in the replies to O

This and plenty of other interesting ideas here: http://news.ycombinator.com/item?id=2810689 http://news.ycombinator.com/item?id=2810689 and in the replies to OP: http://news.ycombinator.com/item?id=2809544 http://news.ycombinator.com/item?id=2809544