Pettegree writes well and amasses information superbly. He refrains from explicitly comparing the technology of print, and its historical impact, with the technology of the Internet. Implicit similarities include issues of intellectual property and privacy, of power, of libel, as well as a general challenge to old modes — the proliferation of personal expression, the contentiousness, the question of how to capitalize, and capitalize upon, a new medium.
This scholarly restraint, leaving his readers to compare and contrast, seems wise. And there are certainly contrasts with the modern age.