Facebook Inc. announced a series of new measures to harden the platform against misinformation Thursday, saying it has needed to ban a Macedonia-based ring spreading fake news during the late 2017 Alabama senate race, and will now start fact-checking photos and video, according to a transcript of a press event published by the social media company on Thursday. That followed earlier announcements about other changes the company is making that appeared to do little to dampen some Canadian parliamentarians’ plans to investigate recent controversies involving the platforms. “Rather than...