Because ad targeting algorithms are limited by the data that's available to them. And most of the data they can get by watching your browsing habits produces te

Because ad targeting algorithms are limited by the data that's available to them. And most of the data they can get by watching your browsing habits produces terrible, near-useless signal, like a list of all the random bullshit you browsed to from sites like Buzzfeed. Or Facebook. Or Hacker News.