https://phys.org/news/2018-09-facebook-election-zuckerberg.html

"We've identified and removed fake accounts ahead of elections in France, Germany, Alabama, Mexico and Brazil," Zuckerberg said.

"We've found and taken down foreign influence campaigns from Russia and Iran attempting to interfere in the US, UK, Middle East, and elsewhere—as well as groups in Mexico and Brazil that have been active in their own country."