I don't know. At least not yet. But digging around the old Salon interwebs I discovered Hubert L. Dreyfus' Kierkegaard on the Internet: Anonymity vrs. Commitment in the Present Age.
Kierkegaard thought that the Public Sphere, as implemented in the Press, promoted risk-free anonymity and idle curiosity that undermined responsibility and commitment. This, in turn, leveled all qualitative distinctions and led to nihilism, he held.
(Via hmmm. I actually can't remember how I got there. Damn you, hypertext. I guess I'll have to look around my history.)