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Using open site explorer, what parameters will best narrow down low quality back links(or back links that could be viewed as un-natural by Google)? ie. blog networks, link schemes, etc.

Thanks Alex! It appears to be penguin, as the rankings dropped April 24th. Quite frustrating as even though these pages have little content, they are really not meant to have more. They are basically just quick posts done on the job site showing what the contractor is currently working on and including a couple pictures. It would be impossible to get the contractor to write a 400 word post each time.

Anyway, we'll keep working on it, thanks for your response.