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which fall into the "unnatural" category
"Using automated programs or services to create links to your site"
"•Links embedded in widgets that are distributed across various sites"
link scheme is too much ambigu
I have some blogs with quality content, good PR an traffic that are linking my site btw, I only make related links.
hmmmm Did it ever dawn on you that perhaps the following is your issue?
How many blogs do you own?
How many times does each of those blogs link to your penalized site?
How do those blogs link to the penalized site? With a single contextual link on one or two relevant posts on each site linking only to the penalized site? Or do you have blogroll links or header/footer links on those "quality" blogs pointing to the penalized site?
What keyword phrases are those blogs using to link to your penalized site? How keyword rich are the anchors? How varied are the anchors? How many different URLs are you linking to on the penalized site from your other blogs?
What percentage of the backlinks for your penalized site come from your blog network?
Do your blogs ONLY link to the penalized site or do they also link to each other?
Building partner pages exclusively for the sake of cross-linking
If all your links were built by you that's your problem right there...I imagine you also over inflated anchor text as well?