San Francisco — Facebook said on Thursday that it would launch fact checking of photos and videos as it expands the effort to curb misinformation to more countries. The world’s largest social network, which has been a frequent target for failing to stop the spread of false news, said it will use machine learning and other technical tools for its effort to clamp down on manipulated images and videos. "One challenge in fighting misinformation is that it manifests itself differently across content types and countries," said a blog post from Facebook product manager Tessa Lyons. "To address this, we expanded our test to fact check photos and videos to four countries. This includes those that are manipulated (for example, a video that is edited to show something that did not really happen), or taken out of context (for example a photo from a previous tragedy associated with a different, present day conflict)." After being blamed for allowing misinformation and manipulation during the 201...

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