Horizobu is an experimental search and exploration engine that was developed between 2008 and 2014. Unlike traditional search engines, Horizobu focuses on providing search and exploration services based on algorithmic and social community concepts. It offers a unique search experience, allowing users to find and discover information in a more efficient and personalized way.

One of the main features of Horizobu is the ability to suggest additional search terms based on the user's initial search. This helps users refine their search and find relevant results more quickly. Instead of overwhelming users with thousands of results, Horizobu presents a limited number of highly relevant results.

In addition, Horizobu offers a new search engine interface paradigm, allowing users to collect and manage their search results. Users can save and share results with their friends, widening their search horizon and offering new surprising insights. Horizobu also emphasizes the importance of user-generated tags and social tagging services like YouTube, flickr, and delicious.

These tags provide valuable information for information retrieval and help users find the most relevant content. Although the experimental project has come to an end, Horizobu has proven to be highly effective, especially for users with good information retrieval skills. Its unique features and user-friendly interface set it apart from traditional search engines, making it a valuable tool for search and exploration