Edited by Allison McCracken, Alexander Cho, Louisa Stein and Indira Neill Hoch, the 404 pages of A Tumblr Book: Platform and Cultures are out with University of Michigan Press, on open access. This monumental work also includes a conversation on Tumblr porn we did with Alex Cho and Noah Tsika, titled “Walled Gardens, NSFW Niches, and Horizontality,” before the platform introduced the NSFW ban late in 2018. How soon things become history, and oh how sorely the old Tumblr is missed!