"Grave doubts" have emerged about the effectiveness of Facebook's moderation system after an investigation by the BBC last year revealed the social network was failing to remove sexualised images of children even after they were reported. Damian Collins, chair of the culture, media and sport committee, made the comments as he criticised Facebook's handling of the images, dozens of which were reported to the company by the BBC and fewer than 20% were removed. After the BBC sent evidence of the photos to Facebook, the social media company reported the BBC to the police for distributing the images, which had been shared on private Facebook groups intended for paedophiles. From a report on BBC: When provided with examples of the images, Facebook reported the BBC journalists involved to the police and cancelled plans for an interview. It subsequently issued a statement: "It is against the law for anyone to distribute images of child exploitation." Mr Collins said it was extraordinary that the BBC had been reported to the authorities when it was trying to "help clean up the network." [...] Information the BBC provided to the police led to one man being sent to prison for four years.