Researchers found bots and Russian trolls mentioned vaccines more often than the average Twitter account over a three-year period, but for different reasons. Russian trolls stoked the debate by tweeting pro- and anti-vaccine messages in an apparent attempt to sow division, while bots that spread malicious software appeared to use anti-vaccine messages that inflame strong responses from both sides to attract clicks.
http://www.washingtonpost.com/scien...t-vaccine-controversy/?utm_term=.9cc5b5c15dda
http://www.washingtonpost.com/scien...t-vaccine-controversy/?utm_term=.9cc5b5c15dda