Q Did a certain researcher by the name of Walter Quattrociocchi use Facebook user data (maybe from Cambridge Analytica) for is Scientific American article called "Inside the Echo Chamber"? He was studying the spread of on-line conspiracy theories and seems to have used Facebook information quite a bit. Significantly, the major "conspiracy" theory he examined was the spread of information critical of vaccines. It seems that the spread of the information was difficult to stop as people tended not to respond to "facts" in support of vaccines. It would appear the only option would be to censor. Since I believe vaccines are dangerous, I believe this researcher discovered that suppressed truths spread organically and persistently. When the health of your child is at stake (to attempt to quote Zen Honeycutt: "A worried mother does better research than the FBI". Humanity can bank on that.