Christopher Mims, for The Washington Post:

As justifiable as the focus on Facebook has been, though, it isn’t the full picture. If the concern is that companies might be collecting some personal data without our knowledge or explicit consent, Alphabet’s Google is a far bigger threat by many measures: the volume of information it gathers, the reach of its tracking and the time people spend on its sites and apps […]

It’s likely that Google has shadow profiles on at least as many people as Facebook does, says Chandler Givens, chief executive of TrackOff, which develops software to fight identity theft. Google allows everyone, whether they have a Google account or not, to opt out of its ad targeting. Yet, like Facebook, it continues to gather your data […]

Google also is the biggest enabler of data harvesting, through the world’s two billion active Android mobile devices. Because Google’s Android OS helps companies gather data on us, then Google is also partly to blame when troves of that data are later used improperly, says Woodrow Hartzog, a professor of law and computer science at Northeastern University.

A good example of this is the way Facebook has continuously harvested Android users’ call and text history. Facebook never got this level of access from Apple ’s iPhone, whose operating system is designed to permit less under-the-hood data collection. Android OS often allows apps to request rich data from users without accompanying warnings about how the data might be used.

Meanwhile, we still don’t have the tools or means to protect ourselves from being targeted by Google, Facebook, and others, or to block their tracking practices completely.