We have a directory site which lists and recommends sources for answers on technical medical issues. All listings are found and reviewed by us; no outside submissions are allowed. All recommendations point toward gov, edu and professional association websites. Pure commercial websites are very rarely listed.
Each listing displays the title of the recommended web page, with a link, and a snippet (citation) of about 30-50 words of content. A typical directory page is devoted to one major subject with subtopics, and lists 50 to 100 outside informational resources.
The problem we face is that by using snippets we are actually building a page that is almost 100% copied content.
My question is: is there a proper way to display snippets that tells bots we are not just another scraper? We are experimenting with <q> and <blockquote> tags, with and without the cite attribute.
And yes, we got creamed by Panda.