Watch live: Mark Zuckerberg testifies at Congress, says his own personal data was also breached

Facebook chief Mark Zuckerbeg has begun answering questions on day two of his testimony before Senate committees in Washington.

5.45pm: Representatives continue to question Mark Zuckerberg, with one saying that "a devil's bargain has been struck" where Facebook has "evolved to a place where it is gathering data on everyone".

Other questions which have arose so far covered the topics of advertising, security and illegal drug selling on the platform.