FACEBOOK is rating users based on how "trustworthy" it thinks they are. Users receive a score on a scale from zero to one that determines if they have a good or bad reputation – but it's completely hidden. The rating system was revealed in a report by the Washington Post, which says it's in place to "help identify malicious actors". Facebook tracks your behaviour across its site and uses that info to assign you a rating. Tessa Lyons, who heads up Facebook's fight against fake news, said: "One of the signals we use is how people interact with articles. "For...