Matt Cutts recently addressed this: http://www.stonetemple.com/matt-cutts-and-eric-talk-about-what-makes-a-quality-site/
Eric Enge: Let’s switch gears a bit. Let’s talk about a pizza business with stores in 60 cities. When they build their site, they create pages for each city.
Matt Cutts: Where people get into trouble here is that they fill these pages with the exact same content on each page. “Our handcrafted pizza is lovingly made with the same methods we have been using for more than 50 years …”, and they’ll repeat the same information for 6 or 7 paragraphs, and it’s not necessary. That information would be great on a top-level page somewhere on the site, but repeating it on all those pages does not look good. If users see this on multiple pages on the site they aren’t likely to like it either.
Eric Enge: I think what site owners may argue is that if someone comes in from a search engine and lands on the Chicago page, and that is the only page they see on the site, they want to make their best pitch on that page. That user is also unlikely to also go visit the site’s Austin pizza page.
Matt Cutts: It is still not a good idea to repeat a ton of content over and over again.
Eric Enge: What should they put on those pages then?
Matt Cutts: In addition to address and contact information, 2 or 3 sentences about what is unique to that location and they should be fine.
Eric Enge: That won’t be seen as thin content?
Matt Cutts: No, something like that should be fine. In a related situation, I had a writer approach me recently and ask me a question. He has this series of articles he provides to gyms that own websites. He wanted to know if there was a limit to how many times he could provide the same content to different gyms, yet still have it be useful from a search perspective for his customers. Would it be helpful, for example, if he kept on rewriting it in various ways.
It gets back to your frog site example. The value add disappears. Imagine 4 gyms in the same small city all offering exactly the same advice. Even before you get to what search engines think, users aren’t going to understand what the difference is between these 4 places. As a user, after reading your content, why would I pick one over the other? For search engines, it’s the same challenge.
Find a way to differentiate and stand out, so that people want to try your product or service and see what they think. When they try it, give them something outstanding and earn yourself a customer.