In rare move, Facebook founder attended meeting to assure Omnicom, Dentsu Aegis Network and Unilever as it faces growing advertiser boycott.
Mark Zuckerberg attempts to put advertisers' minds at ease by stressing his platform has dramatically enhanced its brand safety measures.
Facebook believes the landmark US Federal Trade Commission fine over privacy breaches could be as much as $5 billion.
Let's interpret key passages from Facebook founder's manifesto.
Founder Mark Zuckerberg admits Facebook does not have a strong reputation for building privacy protective services.
Mark Zuckerberg wants end-to-end encryption on all Facebook-owned messaging apps.
Top news, insights and analysis every weekday
Sign up for Campaign Bulletins