The Measles is back. Not in rural Africa or South Asia, but in several major cities in the United States! More than 100 people, including infants, have contracted the disease within the last 6 weeks. Why now? Numerous factors are in play, but according to the World Health Organization, the U.S. and some other developed nations have fallen far behind other countries in measles vaccination. On this week's HashtagVOA, we'll look at the raging debate on social media over vaccinations, examine the hard science, along with the issues confronting parents and policymakers worldwide.