In 2014, The London Book Fair has seen its YouTube followers increase from around 30,000 to more than 100,000 - far more than any of its social media channels.
On Twitter, the B2B event has reached almost 30,000 followers, followed by Facebook and then LinkedIn.
Speaking at C&IT's Association Event Planner forum at The Grange City hotel in London, Thomas said: "We have invested time in uploading podcasts on YouTube, as well as presentations from authors at the exhibition, to keep the momentum of the event going. Last year, a talk from the author of Coraline, Neil Gaiman, attracted 40,000 views."
However, Thomas added that event organisers "need to focus on all social media channels." She continued: "LinkedIn is important for our sales team. Twitter is massively important for getting to the grass roots of our community and blogging is important for our website. We now have 1.7m visitors to our website. We have tried to make it a knowledge hub and a route to industry professionals."