On 11/12/2013 15:59, b...@mnogosearch.org wrote:
Currently it looks like there is no way to stop indexing of spammed
sites. Link spammers even spam this board automatically from time to
time. That software is very pluggable and can be adapted for any type
of cms and submit forms.
One approach would be to build a table of problem/spam links. Then if a
site has any of these toxic links, either drop the website or add the
toxic link to a regexp.
I thought about global dirty solution that could haunt spam during
indexing process. Here is the idea.
Say we have new option for 3.4 + versions:
ExternalLinkCount [maxlinks] [maxpages] [nofollow]
maxlinks is the limit for external links on page. (Spammers are trying
to add direct links for pagerank etc.)
From work I do every month in TLD web usage surveys (measuring how
websites are used in TLDs and the percentages of active/holding
page/PPC/redirects), link spam is either comment form or cracked
Joomla/Wordpress spam links. Comment spam can be be blocked with a
regexp. The injection link spam may be invisible to ordinary browsers
but visible to search engines due to CSS rules. These sites often use an
old version of Joomla or Wordpress or a vulnerable plug-in. But they do
not have many outbound toxic links. And these toxic links generally
change each month.
This will delete any page which has more than 20 external links.
Most news sites will have more than this as they will have a network of
their own sites, analytics, advertising, social media and other links.
Web directories still exist and they typically have more than 20
outbound links per page.
(Will post more later.)
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