The blogdex project was launched by researchers in the MIT Media Lab to crawl the Web and gather data from thousands of blogs to investigate their social properties. Information was gathered by the tool for over four years, during which it autonomously tracked the most contagious information spreading in the blog community, ranking it by recency and popularity. It can, therefore, be considered the first instantiation of a memetracker. The project was replaced by tailrank.com which in turn has been replaced by spinn3r.com.