It is our great pleasure to welcome you to the 2018 ACM International Conference on Hypertext and Social Media (HT 2018) in Baltimore, Maryland, on July 9--12. HT is a top-tier ACM conference in the areas of Hypertext and Social Media. Since 1987, it has successfully brought together leading researchers and developers from the community. It is concerned with all aspects of modern hypertext research, including social media, adaptation, personalization,...