Fighting spam is incredibly tough — a minor change in filters can suddenly block hundreds of legitimate posts and only prevent a few spam posts.
Hardly, almost every other website manages fine.
How many legitimate posts have 7 straight numbers in the thread title?
I brought that up in another post and someone rightly pointed out that spammers would use scripts to work around a lot of checks and balances. All in all, hard thing to do.
You can't "script" around a human review. I get bogus emails all the time from spammers pretending to be friends of mine from Facebook, but I never fall for it.
Thats the point though.
You can tell quite easily who is your friend, and it takes a moment to just reject them.
If you had a list of 20 users needing approval, and all look like they're making legitimate posts then you're just going to approve everything.
All a spammer needs to do to get through is make a legitimate looking post. (which for this site is hard to tell sometimes!)
I couldn't be doing with that.
Automated scripts can't presently get past CAPTCHA challenges. So not only will spammers be required to spend time trying to fool mods with legit-looking messages, but they'll have to pass CAPTCHA first. This will create enough of a hurdle to discourage the great majority of them. We don't need a "perfect" anti-spam system, we just need one that provides more resistance than now (i.e. more than zero).