The inner workings of Facebook are set to be laid bare by a whistleblower once again this afternoon as MPs in the UK prepare to take evidence.

Former Facebook employee Frances Haugen has made numerous blistering claims about the tech giant since releasing thousands of pages of internal research documents she secretly copied before leaving her job in the company’s civic integrity unit.

She has already spoken out about the social network across the pond on television and before politicians, alleging Facebook’s platforms “harm children, stoke division and weaken our democracy”, and that it refuses to change its products because executives elevate profits over safety.

Ms Haugen has also accused the tech giant of being aware of the apparent harm Instagram could have on some teenagers and their body image, and said the firm had been dishonest in its public fight against hate content and misinformation by hiding research that shows it amplifies such content.

This afternoon, she will face questions from a UK parliamentary committee scrutinising the draft Online Safety Bill, as the Government works out how to go about regulating tech firms and social media.

Facebook founder Mark Zuckerberg has rejected the claims made by Ms Haugen, saying her attacks on the company were “misrepresenting” the work it does.

He said the company “cares deeply about issues like safety, well-being and mental health” and that Ms Haugen’s recent evidence to a US congressional committee “just doesn’t reflect the company we know”.

“At the heart of these accusations is this idea that we prioritise profit over safety and well-being. That’s just not true,” he added.

We will be bringing you liver coverage of Ms Haugen's appearance in front of MPs below. She is expected to give her evidence from 2.30pm.