Facebook said it has rid its site of most of the pornographic and violent images posted as part of a spam attack.The social network blamed a browser vulnerability and said it was improving its systems to defend itself against similar attacks in the future.Thousands of the website’s 800 million users have complained about the pictures over recent days.A source told the BBC that Facebook knew who was responsible – and it was not an Anonymous hacktivist.
http://www.bbc.co.uk/news/technology-15753549