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There's a company that sells a real estate portal sites ready for several companies.
And when they install this system they always leave each site in a file calledimobiliarias.php that lists all properties that use your system, so there is a hugeexchange of links between the same sites.
So you can see with the Open Site Explorer that all sites have the same Backlinks.
This would not cause problems with regard to exchange links?
Loss of position or something? Thank you guys.! Sorry. 😛 Google Translator.

I wonder how much characters in a page title so it can be characterized for Googleas duplicate content?
Sorry for the English, I used Google Translator. 
I'm from Brazil 😄
Thanks.