The obvious parts of that Matrix are maintained by Google, Facebook, LinkedIn, Twitter, Tumblr, Pinterest, Amazon and so on. Much more of it is provisioned by names you never heard of. To see what they’re up to, equip your browser with a form of tracking protection that names sources of tracking files. (Examples are Baycloud Bouncer, Disconnect, Ghostery, Privacy Badger and RedMorph.) Then point your browser to the website of a publisher whose business side has been assimilated by the Agent Smith called “adtech”—The Los Angeles Times, for example. T