Privacy and Free speech are the positive/negative (freedom to, freedom from) liberty two sides of the same coin. You can't have free speech without Anonymity (privacy!) and you cant have privacy without free speech.
We can carve excemptions into these. Shouting fire in crowded theatres, or intentionally inciting some crimes (ie calling a hit on somebody, or ordering a crowd to go burn down a mosque, or whatever) might be a reasonable excemption to free speech, and likewise we might throw a few excemptions into privacy (police investigating a murder might have pretty good grounds to tap your phone for instance), but when we make exceptions in one side we logically make excpeptions on the other side.
Thus the free speech argument for network neutrality (companies should not limit the content you read) is the same as the privacy right argument for network neutrality (companies should not spy on the content you read), just viewed from another side.