A very important book for anyone who uses the internet. The big providers -- Facebook and Google especially -- filter the content they present to you, without telling you and without your permission. Even if you think you've elected to receive everything. They do it in the name of personalization, but it's largely to services advertisers, and it affects your online experience in insidious ways.
This book is short, well-written, and easy to understand. Although written by a well-known liberal activist, it is not a political book. Anyone who is concerned about freedom and control over his or her own life should read this. At the very least you should be aware of the issues. But also consider carefully the solutions Pariser suggests -- they are logical and reasonable and entirely within our means if we don't wait too long.