That's true, but the end result, no matter how complicated their algorithm is, is that they don't seem to be doing a very good job of distinguishing offensive from inoffensive tweets.

Very true. Sure they catch some bad stuff, but more often than not it slips past.

They're also doing a very very bad job at responding to reports. If someone makes a threat and you report it, they instantly email, literally the same second you click the button, that they found nothing wrong.