Facebook has discovered a bug which may have affected up to 6.8 million people.
Damian Collins said an engineer had warned about potential data breaches during the international grand committee on fake news in London.
The documents were intercepted when the boss of a US software company in possession of the cache visited the UK on business.
The company’s user base in Europe is falling, according to Facebook’s latest financial results.
The former deputy prime minister, who lost his Commons seat at last year’s election, will move to Silicon Valley in January.
The company had record revenues of more than £1.2 billion in 2017.
The bill has tripled from the amount paid in 2016.
The social media network has released details on what happened.
Facebook discovered the security breach on Tuesday, and waited three days to announce it.
No explanation was given for their sudden departure.