duplicate content ?1234

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When I post a link to my web site from a discussion forum or blog comment I
add a ?<idnumber> argument to the url (ie http:// www.mysite
.com/index.html?1234 . This lets me see how the link originated when I check
my site meter statistics.

I just noticed that google picks up these links and if you search on google
and my site comes up the link on the google search results can be the same
link with the ?1234 is used. So I am wondering will this decrease my google
ranking because of duplicate url's with the same content?


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