[littletables]

The complaints are not about censorship, they are about being de-indexed. "Adult" blogs are a separate category of NSFW, so this response doesn't address the issue - which is specifically regarding "adult" blogs.

In addition to disabling search for adult blogs, Tumblr has enabled robots.txt (Disallow: /) for all "adult" blogs so they're not findable from the outside any more either. On top of all this, Tumblr removed its Erotica category, which was formerly released in January 2010 with much pride on their part.

This all changed sometime early this year, and began to be noticed by sex bloggers both on and off of Tumblr in mid-May.