Chris J. Ratcliffe/Getty Images This story is part of a group of stories called Uncovering and explaining how our digital world is changing — and changing us. After years of allowing anti-vaccine groups and pages to rack up followers on its social network, Facebook announced last month that it wants to lead the world’s largest Covid-19 inoculation information campaign and encourage its users to get vaccinated. It’s also banned users from sharing general forms of vaccine misinformation, like the idea that vaccinations cause autism. Facebook’s big push is meant to help bring an end to a pandemic that has killed more than 2.5 million people around the world. But for some of the people who have for years been sounding the alarm about the dangers of anti-vaccine groups and pages on Facebook and Instagram, the announcement — even if it’s a step forward — feels like too little, too late.