Maybe it's a good classifier by some measure but the error rate is clearly way too high for indiscriminately deleting everything it detects to be a good idea, a

Maybe it's a good classifier by some measure but the error rate is clearly way too high for indiscriminately deleting everything it detects to be a good idea, and that is exactly what Tumblr plans on doing in 2 weeks. Randomly deleting posts that in no way violate the rules is going to piss a lot of people off even if "only" 5% of posts are affected. This is kind of an inherent problem with automated moderation tools. And not new to Tumblr either, there is some sort of mysterious spam filter applied to the ask system that results in a lot of legitimate messages not being sent that people have complained about for ages. And maybe my dash is not a representative sample but there really does seem to be a huge number of misclassified posts.