PERSEC, INFOSEC, even OPSEC: fields to consider when using one’s Internet-connected computation devices (including phones). VPNs, TOR browsing, defeat of various tracking methods etc., are some standard tools, but do not underestimate sowing disinformation.
For one small example, Amazon has a record of ~8,500 books I have “bought” for my Kindles. Of course, MOST of those are freebies, and an [undisclosed] number of those are books I have absolutely no interest in at all (though I do fake having read ’em by “jumping” on through til I reach the end). This ensures that Amazon will keep pitching books to me that I have no interest in reading, demonstrating the company’s lack of true knowledge of my interest areas. (I do download a lot of PD books elsewhere while in TOR sessions, though.)
That’s just an example. There are others. It cheers my heart whenever a company sends my junk mail addresses emails touting things that “will interest me” demonstrating that a particular set of disinformation has taken root.
And now you get to wonder what part(s) of this post is(are) disinformation. . . 🙂