People photograph nameplates after Facebook CEO Mark Zuckerberg and COO Sheryl Sandberg failed to appear at the International Grand Committee on Big Data, Privacy and Democracy meeting on Parliament Hill in Ottawa, Ontario, Canada, May 28, 2019. Canadian lawmakers fumed on Tuesday when Facebook Inc founder and Chief Executive Mark Zuckerberg snubbed an invitation to Ottawa to testify on privacy and democracy before an international panel, slapping the billionaire with a standing summons. REUTERS/Chris Wattie
An empty chair and nameplate are pictured after Facebook CEO Mark Zuckerberg failed to appear at the International Grand Committee on Big Data, Privacy and Democracy meeting on Parliament Hill in Ottawa, Ontario, Canada, May 28, 2019. It was the second time in six months Zuckerberg and Facebook's Chief Operating Office Sheryl Sandberg have failed to show up when invited to address a committee of international lawmakers investigating disinformation, privacy and how to protect democracy. REUTERS/Chris Wattie
A nameplate is pictured after Facebook CEO Mark Zuckerberg failed to appear at the International Grand Committee on Big Data, Privacy and Democracy meeting as members of the committee take part in a news conference on Parliament Hill in Ottawa, Ontario, Canada, May 28, 2019. Zuckerberg and Sandberg will be served with an formal summons should they "decide to come to Canada to go fishing," said Canada's Charlie Angus, a parliamentarian for the left-leaning New Democratic Party. "It's not good enough for them to blow us off." REUTERS/Chris Wattie
Kevin Chan, Global Director and Head of Public Policy of Facebook Canada, looks on as a nameplate for Facebook CEO Mark Zuckerberg is placed in front of him after Zuckerberg failed to appear at the International Grand Committee on Big Data, Privacy and Democracy meeting on Parliament Hill in Ottawa, Ontario, Canada, May 28, 2019. If Zuckerberg and Sandberg do not comply, parliament could hold them in contempt, but it would be mainly a symbolic move. REUTERS/Chris Wattie
A nameplate is pictured after Facebook CEO Mark Zuckerberg failed to appear at the International Grand Committee on Big Data, Privacy and Democracy meeting on Parliament Hill in Ottawa, Ontario, Canada, May 28, 2019. Zuckerberg wrote an editorial published two months ago in which he said he was "looking forward" to discussing "with lawmakers around the world" the same issues being addressed by the committee. REUTERS/Chris Wattie
An empty chair and nameplates are pictured after Facebook CEO Mark Zuckerberg and COO Sheryl Sandberg failed to appear at the International Grand Committee on Big Data, Privacy and Democracy meeting on Parliament Hill in Ottawa, Ontario, Canada, May 28, 2019. Lawmakers from a dozen countries, including Canada, are on the so-called "International Grand Committee on Big Data, Privacy and Democracy". The committee members pelted the two Facebook representatives - as well as representatives from Google and Twitter - with questions about how they handle fake news and privacy. REUTERS/Chris Wattie