By Zoe KleinmanTechnology reporter, BBC News
Prof Kelli Burns has denied saying she believes Facebook is listening to people's conversations via the microphones on their smartphones.
In a news story that went viral this week it was reported that she had said key words around her phone which then appeared on Facebook.
Prof Burns says there was a practical explanation for what had happened.
Facebook has previously told the BBC it does not allow brands to target advertising based on microphone data.
It did not comment on the latest story.
http://www.bbc.co.uk/news/technology-36443926
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