Two months ago, Yahoo! bought Tumblr and promised “not to screw it up.” And then last week, they screwed it up, only to attempt hurriedly to unscrew it:
Friday, it was revealed that Yahoo’s Tumblr brand had exiled its “Adult” blogs separately from its “NSFW” blogs into a non-searchable ghetto where they were de-indexed from both internal and external search — making an estimated 12.5 million blogs unfindable.
Within 24 hours Tumblr has quietly returned the blogs back to internal and external search, and folded its “Adult” blogs into the wider “NSFW” category.
See also Tumblehead David Karp’s statement, which indicates that a lot of blogs which were neither Adult nor NSFW but tagged with various LGBTQ terms were caught in the undertow, requiring Karp’s minions to develop better filters.