I have just started a new site 4 weeks ago and the domain is also brand new (not used by any one in the past). I have written a few articles and all of these articles are already in the top 5 positions for their keywords. I have not build any type of backlinks for the site except only 1 PR7 backlink. So I was thinking how it is possible for a totally new site to have such an amazing rankings? Is it because of that single link??