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It's all because links building, but with this penguin algorithm positing in google SERP can become very nasty game because everyone can very harm competition's site with massive unwanted link building.
In my case I'm that who was make mistake, but what if tomorrow I put footer link in 10 sites that have 50K+ indexed pages to your site, you also can lose your SERP. I'm not planing to do that to anyone but I'm afraid to tomorrow someone don't do it to me. Just asked in Google Webmaster Central did they think about that and waiting for answer.
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