Encrypted messaging service Whatsapp allows users to erase messages for a limited period after they've been sent, however, the deletion is notified in the chat.
Meddling with people's inboxes may be seen as an invasion of someone's private online affairs, but for Facebook, the privacy of Mark Zuckerberg and other company executives seems to weigh more, allegedly in the interest of corporate security.
Facebook has been under pressure this week after admitting that it had "improperly shared" the personal data of 87 million users. But after downloading the Facebook archive data and searching for the same message, users reported that they couldn't find the message from Zuckerberg and reported them as missing.
Facebook chief Mark Zuckerberg said the change will mean "we will hire thousands of more people" to get the new system in place ahead of United States midterm elections in November. She added that Facebook believed Cambridge Analytica deleted users' data because "they gave us assurances, and it wasn't until other people told us it wasn't true".
"We have [internally] discussed this feature several times", the company said in a statement sent to Quartz.
The ICO has been reviewing the use of data analytics for political purposes since May 2017 and is now investigating 30 organizations, including Facebook, Denham said earlier this month.
It said in a tweet on Wednesday that it received no more than 30 million records from a researcher it hired to collect data about people on Facebook.
"We thought the data had been deleted and we should have checked", Sandberg said.
The former Cambridge Analytica employee said that "a lot of people" had access to the data and referenced a "genuine risk" that the harvested data could be stored in Russian Federation. But Facebook informed neither the recipients nor the public that it was taking these steps.
Facebook says most of the affected users (more than 70 million) are in the U.S., along with over a million each in the Philippines, Indonesia and the UK.
With Facebook still being hammered for its actions regarding user data and privacy, Zuckerberg is slated to testify before Congress this coming Tuesday.
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