https://www.occrp.org/en/37-ccblog/ccblog/13225-governments-have-failed-to-learn-from-the-cambridge-analytica-scand
https://knowledge.wharton.upenn.edu/article/can-election-polls-be-trusted/
http://news.sky.com/story/theresa-may-eu-trying-to-influence-general-election-with-threats-10861584