Google webmaster tools and duplicated links [closed]

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I have some problems and im confusing now with google webmaster tools

I have example:

http://site.com/link/text.html

and im using CustomVar on google analytics to track clicks from external site example

http://site.com/link/text.html?promoid=123

Now in webmaster tools i have toons of duplicated links

In robots.txt im add

Disallow: *?promoid

but im not sure if this good idea...

What i should do now, still use robots file and disallow promoid or maybe use rel="canonical" ?

Edit: all links with ?promoid=123 is posted on external site not on my...

Answer 1

This is exactly what canonical URLs are for. It will tell Google that http://site.com/link/text.html is the main URL to use for that page and that any other page using that canonical URL is just a minor variation of that page.