Google and Facebook don't really sell personal data, and least not directly. They might buy some, and advertisers happily give them data, but I rarely hear abou

Google and Facebook don't really sell personal data, and least not directly. They might buy some, and advertisers happily give them data, but I rarely hear about them actually selling it. They do let advertisers run ads that are targeted using this data, but that's not the same as "felling personal data." It's more like selling user attention.