While we get slammed a lot for being optionally anonymous, which is actually one of the awesome things about SR, the consequence of it is just the magnitude of resources to deal with the growing spam problem. I can see why many sites go to requiring a FB login before posting anything -- it makes the process of submitting spam through a robot substantially harder for ne`er do-wells, and thus far more manageable for the site heroes. [Un]Fortunately, SR chooses not to require people to submit their identity, which means that our servers are getting hammered quite constantly by robots. We use all kinds of blacklists and spam detection, which is usually successful, but invariably some gets through. Fear not! We've upgraded additional levels of spam blocking, but if your comment legitimate comment is not showing up, please email us and we'll check to see if the spam guardian is being too militant. Similarly, if you see spam, please let us know so that we can get rid of it.