This paper is a contribution by the WIN Network (international association gathering leading independent market research and polling firms in their respective countries), to discussions on changes in the polling industry. Drawing on feedback from one of its members (bva-group.com), which tracked the 2017 French presidential election using various sources of data (web listening, an online community, and polls collected via POP2017 public opinion platform), it also presents the results of an experiment conducted with two behavioral scientists at the Santa Fe Institute (USA). The purpose of this joint research, which was conducted during the French presidential campaign, was to better understand the factors ? particularly social bubbles ? that influence voters as well as measure the impact of fake news on public opinion.