Reuters are reporting Russian intelligence officials used social media to spy on key officials and associates in Emmanuel Macron's campaign.
The news website has cited an unnamed US congressman and two others, who claim agents created roughly 24 fake Facebook profiles in order to conduct surveillance.
Facebook confirmed to Reuters it had successfully detected and shut down surveillance accounts in France.
In April, it made a statement to say it had shut down accounts which were disseminating false information during the election.
At this time, however, any attempt to spy on Macron's social circles had not been reported prior to Reuters report.
The government in Moscow denied meddling in the French election earlier this year. A spokesman for the Kremlin, Dmitry Peskov, called the allegation "a lie and untrue."