After the 2014 presidential elections in Romania word on the street was that the right-wing candidate won the elections (despite being a heavy underdog, odds were like 4/1) with the help of the social network. During the last weeks before the voting day Facebook had been heavily pushing materials on the diaspora scandal [1], causing massive protest in many cities throughout the country. Indeed my feed looked abnormally political during that time and afterwards it got back to normal.

https://en.wikipedia.org/wiki/Romanian_presidential_election...