Security researchers believe a Russia-based disinformation group amplified and added to the frenzy of social media conspiracies about the Princess of Wales's health. In the days before Catherine revealed her cancer diagnosis in a video message‚ there had been a surge in online rumours and often wild claims about her health‚ adding to the emotional pressure on the princess and her husband Prince William. Now security experts analysing social media data say there were hallmark signs of a co...