Conversations in social media platform can provide new way to communicate vaccine efficacy In the early days of COVID-19 vaccine development, a new social media platform provided a place for like-minded people to discuss vaccines, share misinformation and speculate about the motivations for its development. A new study from the University of Kansas shows people flocked to Parler to discuss the vaccines in an echo chamber-type environment, and those conversations can shed light about how to communicate about vaccine efficacy during health crises. COVID-19 vaccine vial and syringe photo from the U.S. Census Bureau.In the runup to the 2020 election, then-president Donald Trump claimed a COVID-19 vaccine could be ready before people went to the polls. About that time, millions were flocking to Parler, a new social media platform that promised a free speech environment via unregulated posts.