The personalization economy is pernicious because you have no idea what other people are being exposed to.
On the computer attached to my stereo YouTube offers recommendations for music videos from the likes of the Super Furry Animals [1], Kanye West [2], Brothers Johnson and such. Nice stuff, with solid support that I like it, never challenging, unlike the recommendations from my Plex server.
On another computer YouTube shows me videos about stereo equipment, sometimes video game music [3], and also of the genre "Why X sucks" where X could be private equity, "the economy", a movie studio, a video game studio, a fast food restaurant, a clothing brand, etc. I wonder why public sentiment about the economy is so bad despite inflation and unemployment numbers that aren't so bad and think, "How many people are watching these videos?"
Other people get nothing but blackpill incel hell.
Ben Bagdikian wrote a book The Information Machines in 1970 about how personalized news would be possible by 1980 that was quite prophetic and was influential to me when I found it almost 20 years ago. Only recently did I find The Effete Conspiracy, his next book, where he reveals how angry and bitter he was that the work that the media industry sponsored him to do for the RAND corporation was roundly rejected by media owners uninterested in investing in the future and introduced the true but unpopular model that newspapers have a left-wing bias because reporters are left-wing and a right-wing bias because the owners are right-wing.
[1] I get accused of being a furry but I'm not, really
Printed newspaper ads were only the former (and an easily skippable version compared to tv), while this topic is mainly about the latter.