Whatever you think of Mark Zuckerberg, you have to respect him for this. He knows his information is available through the API, he has chosen to make it publicly available.
It is ultimate dogfooding; equivalent to being able to see Eric's and Larry's and Sergey's searches.
EDIT: blackswan is right; tamed down the comparison to Google in the last phrase
On the other hand, his celebrity is now giving greater exposure to the activities of his associates -- they're getting dragged in without much of a choice. I don't think that's very noble of him at all.
It's actually like seeing only a small selection of Larry and Sergey's searches - not all of Zuckerberg's content is public. He says so in one of his status updates that is public.
It is ultimate dogfooding; equivalent to being able to see Eric's and Larry's and Sergey's searches.
EDIT: blackswan is right; tamed down the comparison to Google in the last phrase