Managing Forum Spammers
I got told that some moderators on a few web forums were 'green with envy' at how little an issue spam was on most of my forums.
This guide is really short.
CAPTCHAS
When dealing with spammers, you are typically dealing with two different kinds.
- Automated bots that know your community script and pretty much roll over and die if you deviate from the pattern.
- Actual human beings, either directly or via proxy, that create the account and then add the account to their spamming software or whatever.
The third kind, actual scripts capable of defeating captchas... is surprisingly rare for common community scripts.
The net result is, I have found surprisingly little point in having a complicated captcha. A simple one is absolutely mandatory, but asking people to spell the first number in the current year or the last name of the current US president or whatnot aren't any less effective than much more complicated captchas that get wrapped in most forum scripts.
This has the bonus of increasing community conversions, as well, since no one will get frustrated by your captcha.
Google's new RECAPTCHA is likely a good solution, but I've never had a need for it personally.
Introduction Funnel
A method I developed for one of my now-failed forums, but now repeat elsewhere: Force all new members to create a topic in the introduction forum. Either manually approve members or write a quick script to upgrade them automagically. I currently have this working on Legends of a World Unbent and a few other SMF forums I run, though I originally did this it for a MyBB forum.
This gives your community a bit of added activity as people go about welcoming each other.
In my experience, this tends to pretty seriously thwart spammers - they have to call attention to themselves in order to spam, so... they just do not even seem to try after getting registered.
Note that this requires a forum with proper access controls, and may be tricky with e.g. Drupal.
Stop Forum Spam =
Stop Forum Spam is an amazing service. I set it to bock registrations from known spammer IPs and e-mail addresses. Between SFS and the first technique, only a handful of spammers ever get through to require reporting.
There are integration mods available for many community scripts:
You will need to sign up and get a key from SFS. If your script is different from the one above, chances are a mod exists for it if it is of any meaningful note. Just seek it out.
Choice of Script
The two community packages that I've had the easiest time with handling spammers are Simple Machines Forum and MyBB. I personally like the MediaWiki + SMF combo - it's fairly easy to tack a blog onto SMF and then you pretty much have a full-fledged community site with a single login. Your mileage will of course vary, though at least SMF 2.1 is finally coming out with some more modern features.