The Age of Surveillance Capitalism by Shoshana Zuboff - Its quite a dense book and covers so much about how our data is bought and sold in ths background without most users even knowing about it. I would go out on a limb here and say, this is probably the best book on online privacy at the moment.
Mindf*ck by Christopher Wylie - The whistleblower of the Cambridge Analytica scandal. It is insane to read about how much political influence one company had on a global scale. I don't think this scandal is finished, I really do think there was even more going on at CA that we don't know about.
Antisocial by Andrew Marantz - Its less about privacy per se but more so about the effects that CA and SMs like Meta have had on people. It focuses in the far right movement in America and I read this book just after Mindf*ck and it was scary to see just how influential CA and Meta were at creating this political division that has exploded over the past decade.
Permanent Record by Edward Snowden - The NSA whistleblower that showed how goverment agencies track everyone online in the name of stopping terrorists. There is a lot about Ed's personal life in it as well as his experience at the NSA but I still think its an important book for people interested in online privacy, especially in regards to government agencies and the extent to which they can track you all over the internet.