"If you can influence what people are reading and what version of the truth they're being shown, it has the potential to have an effect," he told the BBC. However, he added, it was difficult to quantify this. "I think the most interesting thing is the fact that Facebook has come out so publicly - there's been a sense of a little bit of reluctance on the part of the large communications companies to acknowledge the extent to which they have been abused," he said.
