Success is very much the intersection of luck and hard work.
When we founded Facebook, we put a lot of hours into it and worked hard every day. 'The Social Network' painted this picture that we were partying all the time, when really we only attended 2 or 3 parties during Facebook's first year.
The first time I looked at Yammer, I thought I was on Facebook. Work is not a social network, with serendipitous communications and photo collections. Work is about managing tasks and responding to things quickly.