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There are thousands of sites out there that have 1x1 pixel invisible links on their pages which have never been detected by the mythological invisible link detector. When you report them, they disappear within a couple weeks.
There are thousands of others that are using the age old font color=background color trick that haven't been detected. Others use style sheets to pull the same trick. Others are just using comment tags. When you report them, they disappear within a couple weeks.
The same goes for cross-linking.
"Ask your SEO firm if it reports every spam abuse that it finds to Google using our spam complaint form at [google.com...] Ethical SEO firms report deceptive sites that violate Google's spam guidelines."
It's a commonly-shared myth around here that Google has algorythyms that detect such things. The Google anti-spam algorythm is a bunch of employees reading spam reports and investigating, then manually removing sites from the index.
If you can email me from a legitimate address @Google.com, I'll gladly take your word for it.
Otherwise, I'm much more inclined to look at the facts which support that there are indeed many filters which are very much automated.
Of course there are going to be tens of thousands of sites that manage to slip below the radar with countless tactics... that doesn't mean that there are no filters whatsoever.
That would be like suggesting credit card companies have no automated security measures, because some people still get away with credit fraud.
Of course it works in Google's favor to have the idea spread of an inescapable all-seeing filter capable of banning sites as soon as the webmaster even thinks of using a dodgy tactic. ;)
But... propagating the "myth" that there are no spam filters at all is not only unsupported by the facts, but potentially harmful to a new webmaster that doesn't know enough to see this clearly.
Google won't do anything about it unless someone reports it. It's a commonly-shared myth around here that Google has algorythyms that detect such things. The Google anti-spam algorythm is a bunch of employees reading spam reports and investigating, then manually removing sites from the index.
Pure rubbish!
With 3 billion plus web pages indexed, the top of the heap get picked through quite thoroughly and routinely.
I'll stick my neck out to say if a site (near the top) had 20+ million competitive pages and employed these tactics their gone immediately, and long before they could be reported.
It's a little like driving down a back road that is rarely used. Speed all you want... you won't likely get caught.
Do it in the middle of the day on a busy highway... the tickets (penalties) pile up until no more license (google results).
If you believe that another site is abusing Google's quality guidelines, please report that site at [google.com...] Google prefers developing scalable and automated solutions to problems, so we attempt to minimize hand-to-hand spam fighting. The spam reports we receive are used to create scalable algorithms that recognize and block future spam attempts.