Advertising, and tracking user data are not inherently bad. The user must know what's being tracked, and probably more importantly, the user must be getting something of value in exchange. Facebook is an ever-degrading skinner box, providing less and less value to users while being addictive and malicious.
Contrast this with something like Google Maps: It's a privacy nightmare too, but it's also incredibly useful.
Contrast this with something like Google Maps: It's a privacy nightmare too, but it's also incredibly useful.