Low vaccine confidence is one of the world's most pressing public health problems. While it has been a challenge since the first vaccines were invented, in the 21st century, the public discourse about vaccines has moved online bringing new challenges and opportunities. This paper explores online communication about vaccines in the last six months, offering insights into how positive, and negative, messages spread. The data analysis was conducted by NetBase Quid, an analytics platform, with additional input from the Vaccine Confidence Project at the London School of Hygiene and Tropical Medicine.