Valentine's Day became Graph Visualization Day, with many people sharing their favorite graph visualizations using Neo4j. The posts showcased a wide range of applications, from game states and bridges in the United States to genetic variants, security issues, and even chocolate products. Users also shared their own projects and experiences with Neo4j, including data visualization, machine learning, and IoT applications. The community came together to celebrate graph visualization and share their love for Neo4j, a graph database that enables fast and efficient querying of complex relationships between entities.