https://motherboard.vice.com/en_us/article/gy7w4b/data-scientists-estimate-a-quarter-of-tumblrs-users-are-there-to-consume-porn

As you may have already heard, starting on December 17, Tumblr will no longer allow porn on its platform. This will hurt the sex workers and communities of people who enjoyed sharing and consuming NSFW content on the platform. But many people have also suggested it might be the beginning of the end for Tumblr, which, perhaps because it has traditionally catered to adult communities, has largely come to be identified with porn.

But how much porn is on Tumblr, anyway? Last year, two Italian universities and Bell Labs attempted to find out. According to their study, published in January 2017, only about .1 percent of Tumblr’s users account for the porn that’s available on Tumblr.