Winnipeg Free Press By: The Canadian Press TORONTO - NDP MP Heather McPherson says Canada's heritage committee has decided to summon Facebook Inc. chief executive Mark Zuckerberg to testify. Facebook Chief Executive Officer Mark Zuckerberg testifies before the House Financial Services Committee on Capitol Hill in Washington, Wednesday, Oct. 23, 2019. NDP MP Heather McPherson says Canada's heritage committee has decided to summon Facebook Inc. chief executive Mark Zuckerberg to testify before it. THE CANADIAN PRESS/AP, Susan Walsh TORONTO - NDP MP Heather McPherson says Canada's heritage committee has decided to summon Facebook Inc. chief executive Mark Zuckerberg to testify. She says Zuckerberg would likely be asked about regulating online hate speech, Facebook's ability to self-police content on its platform and the company's effect on the Canadian news industry.