The document discusses ACON's use of social media to promote sexual health initiatives. It describes two campaigns - The Big Picture from 2011-2012 which aimed to educate gay men about HIV, and Ending HIV from 2013 onward which seeks to end the HIV epidemic by 2020. For The Big Picture, ACON used Facebook, Twitter, and a website to share information and drive traffic. While engagement was relatively low, evaluation found social media was effective for reaching audiences. For Ending HIV, ACON took a new approach, focusing on user-generated content and listening to audiences, which led to increased reach, interactions, and engagement over time. Lessons included social media's ability to boost traffic and frequency while facilitating discussions beyond direct