Between 1 October and 30 November 2016, ahead of the Italian constitutional referendum, five out of ten referendum-related stories with most social media participation were hoaxes or inaccurate. Of the three stories with the most social media attention, two were fake. Prime Minister of Italy Matteo Renzi met with U.S. President Obama and leaders of Europe at a meeting in Berlin, Germany in November 2016, and spoke about the fake news problem. Renzi hosted discussions on Facebook Live in an effort to rebut falsities online. The influence became so heavy that a senior adviser to Renzi began a defamation complaint on an anonymous Twitter user who had used the screenname "Beatrice di Maio".