The Neo4j blog has highlighted several key topics from 2021, including the Pandora Papers dataset and its use of graph databases to analyze financial secrets. The blog also covers various tools for visualizing Neo4j graph databases, such as Graph Data Visualization, and provides a one-stop solution for importing CSV files into Neo4j. Additionally, a tutorial on constructing a biomedical knowledge graph using NLP techniques is shared, while the company announces that Certified Neo4j Professional t-shirts are available with the purchase of the certification test. The Neo4j Certified Professional exam tests skills in Cypher, basic graph data modeling, and multi-database features, among other areas.