Posts: 10,815
Name: Steven Bradley
Location: Boulder, Colorado
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Cloaking is when you show a search engine different content that what you show to a human being.
You might have some code to check the user-agent for example and if it shows as googlebot you show a highly optimized page that might not read well for real people. If the user-agent shows your visitor isn't a search engine you show them different content that does read well.
There are actually some legitimate reasons to use cloaking. A Flash site might use cloaking to show a search spider the exact text that's in the Flash application.
Another use might be showing one version of a page to a spider that comes from the US, while showing a different version of the page to a user from the UK. Maybe just to use different spellings of words like optimization and optimisation.
The webmasterworld thing started new debates on the subject since Google does seem to let some sites get away with cloaking while telling other sites it's not ok.
Search Engine Land had some good articles about it a few weeks ago including this one, which also links to some other articles on the subject.
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