[Pmwiki-users] spammers - using a wheel that has been invented
Patrick R. Michaud
Mon Nov 29 09:33:56 CST 2004
On Mon, Nov 29, 2004 at 09:54:59AM -0500, Neil Herber wrote:
> In the PHPBB2 system, they have a facility called "word censors". If a user
> attempts to post with a word that appears on the list, PHPBB2 substitutes
> replacement text. The word list and the substitutes are controlled by the
> administrator. Perhaps PmWiki could adopt this idea.
Well, an administrator can already do this by just adding custom markup--
Markup("spammer.cn", "<links", "/spammer\\.cn/", "suppressed");
However, a spammer can get around this by using alternate encodings
or IP addresses instead. For example, I can write www.example.com
in an href as any of:
So, we'd have to also convert html entities and disallow numeric addresses.
Perhaps wiki spammers wouldn't ever write links this way because it defeats
the purpose of spamming (i.e., increasing Google page rank), but I
wouldn't bet on it.
And besides, it's fairly easy for spammers to create redirects to get around
the blacklists (that can also deceive Googlebot into not detecting the
I'm not saying blacklists aren't another useful tool for us to have, I'm
just pointing out some of their limitations and that they just add another
level of maintenance and complexity.
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