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when a user gives Facebook a phone number for two-factor authentication or in order to receive alerts about new log-ins to a user’s account, that phone number became targetable by an advertiser within a couple of weeks

I’ve been trying to get Facebook to disclose shadow contact information to users for almost a year now. But it has even refused to disclose these shadow details to users in Europe, where privacy law is stronger and explicitly requires companies to tell users what data it has on them.

To test the shadow information finding, the researchers tried a real-world test. They uploaded a list of hundreds of landline numbers from Northeastern University. These are numbers that people who work for Northeastern are unlikely to have added to their accounts, though it’s very likely that the numbers would be in the address books of people who know them and who might have uploaded them to Facebook in order to “find friends.” The researchers found that many of these numbers could be targeted with ads, and when they ran an ad campaign, the ad turned up in the Facebook news feed of Mislove, whose landline had been included in the file; I confirmed this with my own test targeting his landline number.

“I think that many users don’t fully understand how ad targeting works today: that advertisers can literally specify exactly which users should see their ads by uploading the users’ email addresses, phone numbers, names+dates of birth, etc,” said Mislove. “In describing this work to colleagues, many computer scientists were surprised by this, and were even more surprised to learn that not only Facebook, but also Google, Pinterest, and Twitter all offer related services. Thus, we think there is a significant need to educate users about how exactly targeted advertising on such platforms works today.”

There are certainly creepier practices happening in the advertising industry, but it’s troubling this is happening at Facebook because of its representations about letting you control your ad experience. It’s disturbing that Facebook is reducing the privacy of people who want their accounts to be more secure by using the information they provide for that purpose to data-mine them for ads.

When I asked the company last year about whether it used shadow contact information for ads, it gave me inaccurate information, and it hadn’t made the practice clear in its extensive messaging to users about ads

This year, we expect to see more brands rely on Messenger as a platform to market and sell products to highly targeted audiences.  With Facebook’s new Messages Objective, brands now create ads that allow prospective customers to immediately be connected to a live customer service representative or bot. Sephora, the multinational cosmetics chain, saw an 11 percent increase in makeover bookings with used Facebook’s targeted ads along with Messages Objective.

he agency has pushed companies nationwide, including giants like General Motors, Target and Costco, to rewrite their social media rules.

“The providers of social networks are responsible when their platforms are misused to spread hate crime or illegal false news,” German Justice Minister Heiko Maas said in a statement. The proposed law would apply only within German borders. But Maas said Wednesday he would press for similar measures across the European Union. A number of European countries have also sought to counter the fake-news scourge. The Czech Republic recently inaugurated a special unit charged with denouncing false reports. Should the German measure become law, however, experts say it would amount to the boldest step yet by a major Western nation to control social-media content. Depending on how obviously false or illegal a post is, companies would have as little as 24 hours to remove it.

In addition to fake news and hate speech, the draft bill would target posts seen as inciting terrorism or spreading child pornography. Officials have cited a surge of hate speech across the Internet as a major factor behind the rise of far-right violence in Germany, including arson attacks at refugee centers and assaults on police officers.

One of the companies most affected by the bill is Facebook, which has sought to sidestep such laws by taking voluntary measures to curb the spread of fake news. The company echoed concerns that the bill would wrongly foist upon corporations a level of decision-making on the legality of content that should instead reside with German courts.

Rather than setting a new standard, officials also say they are simply forcing social-media outlets to comply with existing laws governing hate speech and incitement in Germany. Incitement and defamation laws here are far broader than in the United States; for instance, laws on the books forbid defaming German leaders and make denial of the Holocaust a crime.