Scrapebox on them. I've seen other people post experiences where they've built a few hundred links in Scrapebox and now they're hitting No.1 for 10 keywords and making thousands of hits per day. I've used it on 6 sites so far using slightly different methods on each to mix it up. But every single one has dropped out of the SERPS completely. Has anyone had this happen to them? So far Scrapebox has been the touch of death to my sites! I've read al the tips and watched the vids. I use private proxies for posting, mix the blogs up, high quality, etc. I did get a boost in rankings for 3 of the sites but they dropped a couple of days later. Sites are all 6-12 months old.