The European Parliament on Tuesday invited Facebook chief Mark Zuckerberg to speak following revelations that a firm working for Donald Trump's US presidential campaign harvested data on 50 million users, AFP reports.
The parliament and the European Commission, the 28-nation EU executive, have already called for an urgent investigation into the scandal.
"We've invited Mark Zuckerberg to the European Parliament," its President Antonio Tajani tweeted.
"Facebook needs to clarify before the representatives of 500 million Europeans that personal data is not being used to manipulate democracy."
Facebook has faced worldwide criticism over the claims that Cambridge Analytica, the UK data analysis firm hired by Trump's 2016 campaign, harvested and misused data on 50 million members.