Free speech is 100% good, right? Well, it’s a lot more complicated than that. In Free Speech: Ten Principles for a Connected World, the author illustrates how difficult it is both to define what should be censored (because there are limits, for everyone, inconveniently tied to cultural norms) and how it should be censored. He focuses on the twin ideas that, if most speech today is through the Internet, then (1) individual nations cannot regulate what is essentially happening worldwide and (2) that the companies that control the storage and distribution of speech are put in a situation of control, often above what nations can do.
I found the book to be surprisingly confusing in its structure (in particular, I cannot recall any of the ten principles of the title) but the many examples and detailed investigations of why, exactly, it is hard to speak freely.