WASHINGTON - Slightly defensive under pressure, a wary Facebook founder and CEO Mark Zuckerberg fielded questions deftly during his first Congressional hearing on Tuesday (April 10) but conceded, when pressed, that regulation may be needed.

Mr Zuckerberg apologised several times for Facebook's failure to protect the data of around 87 million people in the Cambridge Analytica scandal, at the hearing on data abuses at the social media giant.