Are aggregate sites penalised for duplicate page content?

[JonasNielsen]

Hi all,We're running a used car search engine (http://autouncle.dk/en/) in Denmark, Sweden and soon Germany. The site works in a conventional search engine way with a search form and pages of search results (car adverts).The nature of car searching entails that the same advert exists on a large number of different urls (because of the many different search criteria and pagination). From my understanding this is problematic because Google will penalize the site for having duplicated content. Since the order of search results is mixed, I assume SEOmoz cannot always identify almost identical pages so the problem is perhaps bigger than what SEOmoz can tell us. In your opinion, what is the best strategy to solve this? We currently use a very simple canonical solution.For the record, besides collecting car adverts AutoUncle provide a lot of value to our large user base (including valuations on all cars) . We're not just another leech adword site. In fact, we don't have a single banner.Thanks in advance!

[OlegKorneitchouk]

Yeah, having the same listings across multiple domains isn't doing you any favors. The best set up is to have all the languages on one domain and make use of the multilingual canonical support. Not sure if that can be applied across different domains.

[JonasNielsen]

Thanks for the answer Oleg.

Just to be clear; my worry is that Google view cars within one country as duplicate content, because they appear on different search URLs. Each country is placed on separate domains, so they should not influence each other.

The car listings are being indexed by Google. My fear was that Google's penalization algorithm works in a gradual way, meaning that maybe we are being penalized for duplicate content, even though the pages are being indexed. Does that sound correct?

Everything related to multilingual works pretty well I believe.

[OlegKorneitchouk]

Are the search result pages being indexed? If you just have the car listings indexed and have correct multilingual alternative tags set up, you should be in good shape. Change up the content to match the specific countries language & currency.

Multilingual search might be more difficult to manage since they use different search terms.