Here is my theory. Google definitely takes link velocity into consideration. If you are overzealous with your backlinking efforts, Google will notice the activity, and red flag your website triggering a manual review. Now this is where I believe having a site that is 100% Google friendly comes into play. If a manual reviewer looks at your site and see that you have thin content, you are keyword stuffing, have scripts on your site, doorway pages etc, they apply a penalty. If your site abides by all guidelines, you should be safe. I believe they also take into consideration the age, and authority of your website.
I believe that over backlinking to your website is the #1 cause of ranking penalties. Every site that I have looked at that has gotten hit usually has two common factors:
1) Ranking penalty usually occurred right after a massive backlink campaign. You could see a huge jump in spider activity on the websites in webmaster tools just before the ranking penalty was assessed.
2) Each website I looked at had at least one issue, which could be considered a Google guideline infraction.
Also, websites that are newer where more predisposed to getting ranking penalties.
So in conclusion, my theory is that if you build Google ball licking websites, and don't over backlink to your websites at any one time you should be fine. Of course there is exceptions to the rule, but again this is
just a theory
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