Facebook CEO Mark Zuckerberg has been grilled by US lawmakers for a second day in a row, repeating his apology from the first session and revealing his own data was scraped by an app.

Mr Zuckerberg also conceded regulation of social media is “inevitable” as the internet grows “in importance around the world in people's lives.”

Mr Zuckerberg defended the platform, though, saying people are “proactively” choosing to share their data when they post information to Facebook and this provides a “control… every time.”