From the Introduction: The metaphor of watchdog has long been popular as shorthand for the structural role of the free press in a representative democracy. Should government officers fail in their responsibility to exercise power on behalf of the general public, that watchdog would alert the citizens at large to that malfeasance. ... But what of that watchdog's leash? If the people need a watchdog to make sure the institution of government does not abuse the power they have granted it, would there not be a need for a comparable check on the press, as a social institution with power in its own right? ... [B]logs lack direct control over the activities of the mainstream press, yet many of them monitor the mainstream press ... . [T]he watchdog's bite is the threat of diminished credibility, manifest as lost votes for politicians and as reduced consumption of their media products for the mainstream press. ... This little book is not intended as either an endorsement or a criticism of the ideological or political views of any bloggers ... Instead, this work is intended as an exploration of the distinct types of media criticism which have evolved in the blogosphere, and it does make the argument that the blogosphere, as an emergent social object in itself, is a constructive addition to the media mix. So ... we might now be seeing the emergence of a Fifth Estate in our social system, a watcher of the watchdog. In one sentence, the thesis of this little book is that the blogosphere is in the process of maturing into a full-fledged social institution, albeit a non-traditional one: emergent, self-organizing, and self-regulating.