The interesting point in the article is that in the response to the first and the last question Zuckerberg says that Facebook’s goal is to "help everyone in the world communicate more efficiently." I’m not sure if the users would articulate the company’s goal in those specific terms, if they were asked. I’d probably say that their its goal is to connect everybody.
Right. Users of ourdoings.com would be less efficient communicating their real-life doings via Facebook, and users of friendfeed would be less efficient communicating their online doings that way.