Need some ideas if people could chip in their thoughts or ideas. I'm thinking, penalties, sandbox, time?? We built 6 different sites, different niches, different hosting etc about 3 months ago. Of the 6: 1 site ranked overnight to #3 in yahoo and has had traffic since day 1 and produced a steady income via Yahoo and is now finally doing the Google dance in and out of 55th spot. 3 sites are ranking in the top 100 in yahoo, one is ranking in top 100 google and slowly climbing. 2 have never had a ranking inside the top 1000 in google, but are ranking in yahoo/bing in the 100-200 range. ----------- Our competitive research includes Moz kw difficult, # of all in titles, # of pages for choosing the niche, all seemed fairly easy. In the 30 range in Moz scoring. ----------- Based on our domain research all domains were brand new, never owned. We know this likely will cause google to shun them for quite some time while they age. ----------- All sites have had link building campaigns dripping links 4 tiers deep with only articles, wikis and web 2.0's on the main tiers supplemented by blog comments, image comments etc. About 2 links a week on average on tier 1 directly linking to money site. All tier contextual links are do follow, with a good mixture of PR. ------- All 6 sites have 1500 word articles on the home page + 5 pages of scraped spun very readable content with videos and images in them. ************** I'm sure there's more that could factors here, but does anyone has any ideas what could be holding the 2 remaining sites from even getting a nod from Google? 3 months isn't long, we know, so I'm going to do another case study where I build a expired domain the same way to see if something surfaces about the methods.