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Twitter disclosed Tuesday that it "unintentionally" used some email addresses and phone numbers for advertising even though the information was provided for account security.

Why it matters: It's the latest example of a tech company misusing user data.

"We cannot say with certainty how many people were impacted by this, but in an effort to be transparent, we wanted to make everyone aware. No personal data was ever shared externally with our partners or any other third parties."
— Twitter said in a blog post

But but but: The information was used to help tailor which advertising some users saw.

"As of September 17, we have addressed the issue that allowed this to occur and are no longer using phone numbers or email addresses collected for safety or security purposes for advertising."

  • It's not immediately clear why Twitter is only now notifying users.

Meanwhile: While in Twitter's case the use was accidental, Facebook intentionally used phone numbers provided for security to target ads — at least until the FTC complained.

Go deeper

Narrowing the employee divide

Illustration: Shoshana Gordon/Axios

Companies are narrowing the blue- and white-collar experience as they're forced to adapt to a worker-led market.

Driving the news: Basic office tools and concepts like corporate communications and schedule flexibility are migrating to frontline operations through investments in technology.

52 mins ago - Health

U.S. to buy 500 million more Pfizer doses to share with the world

A nurse fills a syringe with a dose of the Pfizer-BioNTech COVID-19 vaccine. Photo: Ben Hasty/MediaNews Group/Reading Eagle via Getty Images

The Biden administration is planning to purchase 500 million more Pfizer-BioNTech coronavirus vaccine doses to donate to the world, officials said in an op-ed Wednesday.

Why it matters: The move represents a big step toward making the U.S. a major global vaccine supplier just as China has ramped up exports of its Sinopharm, Sinovac and CanSino vaccines, which can be stored at normal refrigerator temperatures.

D.C.'s building boom grinds to a halt

Illustration: Brendan Lynch/Axios

The decades-long building boom that remade Washington D.C. is screeching to a halt, undone by broader construction trends and the legacy of the post-pandemic workplace.

Why it matters: Dizzying construction has reshaped the city, reinvigorated downtown and created bustling new communities.