Some of you know me on here for doing e-commerce. My goal is to create hundreds of e-commerce sites all targeting specific niches. Anyways, I had one site which was completely sandboxed for 3 months. Mainly because I started blasting it with about 30k web 2.0s right out the gate. All shitty content and spun garbage. I thought for sure the site was gone for good but I still kept on building links. Still building highly spun but scraped as well. 3 months later after I had almost completly given up, the site jumped to 1st page for almost all main keywords and currently on 3-5th page for 30,000 exacts. I was getting two hits a day just two days ago. I also blasted with wiki and scrapebox with thousands of comments. Here is the thing though. I didn't even target my main keywords at all. My approach was to load up all long tail keywords and main keywords and just blast like they were the same in weight. On page was good content and optimized, but I didn't even worry about which keyword I was targeting. I also used many random "click here's" and naked URLs. All sites that I have done this have not been hit. Yes, it takes longer. My take away from this is that it is all keyword related penalties. The only site that did get hit of mine was like 60% main keyword. Start thinking 5% main keyword and you should be good. Thanks. Sorry I am a little unorganized. Hope this helped someone.