Google lets you tell them which parameters to ignore
Google added a new helpful feature to the Site Configuration Settings Sections of Google Webmaster Tools: Parameter Handling. With Parameter Handling you can tell Google which parameters to ignore when crawling your site.
In webmastercentral Google gives you a list of parameters they found in the website urls. It places a “Ignore” or “Don’t ignore” next to it so you can choose wether or not the suggested parameters should be ignored or not. You can also do suggestions for parameters which are not there. It's a nice feature, but the question arises why Google comes with it.
The feature should help with duplicate content issues. According to Searchengineland its something that already exists in several different tools. Searchengineland names some of them.
Vanessa Fox says:
"The two most common reasons for optional parameters and that this feature will work well for are:
Tracking codes used for analytics data (in this case, you may not want to implement a 301 redirect from the long version of the URL to the canonical one since you could lose the data)
Page layout changes, such as sort orders (in this case, the code on the page uses the parameter to change the layout of the page, but from a search engine perspective the content on each version is the same, just in a different order)"
It's not very clear why Google added this feature, so will we use it? You tell us.
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