Mr Zuckerberg, who has repeatedly apologised for the massive data breach, told the US Congress in April that the more stringent European Union rules could serve as a rough model globally.
Facebook CEO Mark Zuckerberg is expected to speak with leaders of the European parliament next week about the data protection scandal that has engulfed his company but might avoid a public testimony like the one he endured in the U.S. The social networking company reported $1.69 earnings per share (EPS) for the quarter, beating analysts' consensus estimates of $1.25 by $0.44. And several of the US lawmakers often appeared to fail to grasp the technical details of Facebook's operations and data privacy.
We've reached out to Facebook to ask why Zuckerberg will not take European parliamentarians questions in a public hearing.
Yet the question of whether Zuckerberg should explain himself publicly remains a point of contention.
"I will not attend the meeting with Mr Zuckerberg if it's held behind closed doors", Verhofstadt tweeted.
The European Commission, the EU's executive agency, has used the scandal as an example of why its strict new privacy rules kicking in at the end of next week are justified.
Tajani said that simply showing up to explain himself was already a good move. "It is a step in the right direction towards restoring confidence".
"Our citizens deserve a full and detailed explanation", Tajani said in a statement posted on Twitter.
The Information Commissioner's Office served notice to SCL Elections, Cambridge Analytica's parent, to provide the information it holds on David Carroll, saying failure to do so would be a criminal offence punishable by an unlimited fine.
Mr Zuckerberg is also confirmed to visit French President Emmanuel Macron in Paris on May 23, along with other tech leaders, according to the French presidency.
But he will not appear before the British parliamentary committee investigating the matter, but rather has agreed to appear before the European parliament at a closed-door meeting.
Zuckerberg has so far declined to appear, to the British lawmakers' annoyance.
"Although Facebook says Mr Zuckerberg has no plans to travel to the United Kingdom, we would also be open to taking his evidence by video link, if that would be the only way to do this during the period of our inquiry", committee chairman, Damian Collins writes in a letter to Facebook.