Since we don't have any real stats we can't classify how well the algorithm is doing, one important thought though is how the algorithm is designed. If you got

Since we don't have any real stats we can't classify how well the algorithm is doing, one important thought though is how the algorithm is designed. If you got a good filtering method you can either optimize for a false positive rate or a false negative rate. Let's compare it to a simple spam filter (because if you look at it objectively that's all it is) would you rather have spam in your inbox or loose mails to your spam filter? Spam filter (normally) prioritize a high false negative so you have less spam, but don't loose content. Having a filter that obviously has a high false positive rate is just bad for the content creators (on which tumblr depends)