Its name derives from Doktoro Esperanto , the pseudonym under which physician and linguist L. L. Zamenhof published the first book detailing Esperanto, the Unua Libro, on July 26, 1887. Esperanto has a notable online presence. lernu!, the most popular online learning platform of Esperanto, reported 150,000 registered users in 2013, and sees between 150,000 and 200,000 visitors each month.
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