...Facebook is facing a class-action lawsuit on behalf of the 622,161 Canadians who may be among 87 million people whose personal data was improperly harvested.  The proposed class action comes on the same day Cambridge Analytica — the British political consulting firm that’s now the subject of political probes in Canada, the U.S., and the U.K., as well as an investigation by Canada’s privacy commissioner — said it was shutting down and filing for bankruptcy because news reports about the privacy scandal had “driven away virtually all” of its customers and suppliers.  A lawsuit filed...at the Ontario Superior Court of Justice is the second class-action to hit the Silicon Valley heavyweight over the Cambridge Analytica drama.  Last month a class action was launched in U.S. district court on behalf of 71 million U.S. and U.K. users whose data may have been scraped by the firm, which has been accused of building detailed voter profiles for electoral gain.