JesterMagic - 12:53 am on Mar 27, 2013 (gmt 0)
I have about 4 competitor sites which I just looked at that have been in the serps for a few months now and are slowly taking over different keywords. They are EMD domains which is not necessarily a bad thing but after looking more closely at them they are all pretty much the same. Same Wordpress type site and theme with just the graphics and content different. You can tell the same person wrote it but just changed things enough. Looking further into the backlinks from Alexa I see these sites have about 70 or so different backlinks.
I checked out over 10 of the backlinks and I see they are blogs with each about 6 articles with keyword loaded entries. They link to about 6 different sites in each article. 2 sites are usually theirs and the other 4 are genuine sites like Wikipedia, Techcrunch, etc. Some of the sites do share ips.
Basically someone created these sites which look okay at first glance and almost all of the backlinks these sites have. I am not sure how an algorithm could spot this but it just shows you the lengths people go to rank their sites.