I have had a number of conversations with entrepreneurs recently where it became clear that their own personal dislike for email/twitter/Facebook/mobile notifications stood in the way of growth. It would be nice to think that you could build a service that is so awesome that everyone who discovers it will (a) instantly get all their friends to use it and (b) keep coming back all the time. But that rarely happens. Instead, there is a lot more evidence to suggest that it is much harder to err o...