Excerpts from Henrik Ingo's message of Sun Jan 29 01:29:43 -0800 2012:
> No, the captcha is there but spammers work around it. I'm not sure but
> I think they simply hire cheap labor in Asia and Africa to manually
> type in their spam. The only spam-protection that I've found to really
> work are the services mollom and akismet that do spam-filtering on a
> global scale, mostly based on the links embedded in a post. I don't
> know if a plugin to these exists for mediawiki.
>
Defeating captchas is easier than that.
step 1. register a domain
step 2. mirror a bunch of free porn onto a cheap server under said domain
step 3. setup a script which proxies encountered captchas presented to your
spam bot to users trying to access your free porn site, and submits back
the answers to the server.
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