For more details, see California Unanimously Passes Historic Privacy Bill (Wired)
"The California Consumer Privacy Act is one of the toughest U.S. regulations targeting Silicon Valley, where recent privacy mishaps — many involving Facebook — have left consumers clamoring for greater protections online. The law requires tech giants to disclose the kind of data they collect about consumers and allows Web users to opt out of having their information sold to third parties, including advertisers.California legislators just adopted tough new privacy rules targeting Facebook, Google and other tech giants -- The Washington Post
The new privacy rules, which are slated to come into effect in 2020, apply only to residents in the Golden State. That leaves time for corporate critics such as AT&T, Comcast, Facebook and Google to resume lobbying aggressively to revise it over the next year.
Going forward, though, California’s privacy protections could force tech companies to change their business practices nationwide, rather than maintaining two systems: one in California, and another for everyone else. Apple, Facebook and Google took a similar approach in May after European regulators began implementing new privacy rules, known as General Data Protection Regulation, or GDPR."