On Facebook, moms debate if the vaccine could harm their kids' reproductive health. And in tweets, people share claims about adverse reactions to the shot. They're all talking about HPV ...

Gardasil is a vaccine, licensed for use in June 2006, by the FDA. It targets four strains of human papillomavirus (HPV) -- HPV-6, 11, 16, and 18. HPV-16 and HPV-18 account for about 70% of all ...