Facebook Inc has paid contractors to transcribe audio clips from users of its Messenger service, raising privacy concerns for a company with a history of privacy lapses.
The practice was, until recently, common in the tech industry.
Companies say the use of humans helps improve their services, but users are not typically aware that humans and not just computers are reviewing audio.
Transcriptions done by humans raise bigger concerns because of the potential of rogue employees or contractors leaking details.
The practice at Google emerged after some of its Dutch-language audio snippets were leaked.
More than 1,000 recordings were obtained by Belgian broadcaster VRT NWS, which said that some contained sensitive personal conversations — as well as information that identified the person speaking.
“We feel we have some control over machines,” said Jamie Winterton, director of strategy at Arizona State University’s Global Security Initiative. “You have no control over humans that way. There’s no way once a human knows something to drag that piece of data to the recycling bin.”
Jeffrey Chester, executive director for the Center for Digital Democracy privacy-advocacy group, said it was bad enough that Facebook uses artificial intelligence as part of its data-monitoring activities.
He said the use of humans as well is “even more alarming.”
Facebook said audio snippets reviewed by contractors were masked so as not to reveal anyone’s identity.
It said it stopped the practice a week ago. The development was reported earlier by Bloomberg.
Google said it suspended doing this worldwide while it investigates the Dutch leaks.
Apple Inc has also suspended its use of humans for the Siri digital assistant, though it plans to bring them back after seeking explicit permission from users.
Amazon.com Inc said it still uses humans, but users can decline, or opt out, of the human transcriptions.
A report from tech news site Motherboard last week said Microsoft Corp also uses human transcribers with some Skype conversations and commands spoken to Microsoft’s digital assistant, Cortana.
Microsoft said in a statement that it has safeguards, such as stripping identifying data and requiring non-disclosure agreements with contractors and their employees. Yet details leaked to Motherboard.
After the Motherboard report, Microsoft said it “could do a better job” explaining that humans listen to the conversations.
It updated its frequently asked questions for Skype to say that using the translation service “may include transcription of audio recordings by Microsoft employees and vendors.”
It makes sense to use human transcribers to train artificial-intelligence systems, Winterton said.
However, the issue is that companies are leading people to believe that only machines are listening to audio, causing miscommunication and distrust, she said.
The companies’ privacy policies — usually long, dense documents — often permit the use of customer data to improve products and services, but the language can be opaque.
Irish data-protection regulators say they are seeking more details from Facebook to assess compliance with European data regulations.
The agency’s statement says it has also had “ongoing engagement with Google, Apple and Microsoft” over the issue, though Amazon was not mentioned.
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