Four month ago I bought a new domain just to promote a free product to help my list grow up. It has just one page, the opt-in page. Nothing more. It is not SEO optimized and I have built NO backlinks. I just uploaded it and sent traffic to it for about a couple of weeks. Then I just forgot about it. A couple of weeks ago, I thought about the site and went check it. It had (and still has) PR3. Weird, right? I run several sites and have never seen the PR of any site go up so fast doing absolutely nothing. Has this happened to anybody here?
Is that google ranking wrong ? If from PR 0 --> PR 1 without to do nothing, I have got this experience before