In a conference call with reporters, Facebook chief executive/chair Mark Zuckerberg defended his company against charges that he and chief operating officer Sheryl Sandberg hid problems regarding Russian interference and other issues. Politicians have discussed opening a federal investigation into possible campaign finance violations and creating competition laws to curb the company, while shareholders have called for Zuckerberg’s ouster and activists have complained to the Federal Trade Commission. Continue reading Facebook Deals with Criticism, Marketers Mull Over Options