Mail services can filter out most spam, with a lot of it being seemingly normal mail, and I'm sure there are FOSS solutions for it out there, and if not, there exist dozens of algorithms that could be implemented. I mean, link-as-title spam could be deleted immediately, no question about it. As for the rest, at least half of it looks like markov chain generated text, not to mention virtually all of it has a huge concentration of buzzwords like random medical or cosmetic terms.And even if it's real users, which I doubt(names that seem extremely common in randomly generated spam names), they post their spam almost immediately(1-2 minutes) after registering, have no real profile info whatsoever save for perhaps the category the spam is relevant to, blah blah blah.I just don't buy this being impossible or even difficult to filter, I'm pretty sure I could code it myself.
They already said that it's already being filtered, but it's not bots, it's real people doing the spamming, and it's thus hard to fix; meanwhile users complain when they can't post because they have to fill a spam check.
As rinseandrep said, it is real people. Captcha is in place, IP blocking is in place. But when spammers go in manually, create accounts, and post content, the most we can do is delete them as soon as they are posted. (which is what we've been doing).It does help however to report the questions as spam as soon as you see them as well as flagging the users profile.