My Last Minute Trip to Atlanta, USA for the Social Influencers Travel Summit (SITSum 2016) SITSum is the Social Influencers Travel Summit. It is an exclusive, invitation – only event for individuals with strong social media or blog presence. During the event, the invitees had the chance to learn the best industry practices from one another. Aside from meeting fellow influencers, you get to tour around Atlanta. The event was organized by the Atlanta Tourism Board.