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You see different rankings on different computers depend on what kind of browser you use and if you have or haven’t deleted cookies and plug-in data. This does not mean that the real ranking changes, but only that your computer recognizes your searches and shows them  first.

Hi,

What is your CTR, you can check impression from webmaster tools and calculate the Click  per impression. You can start by focusing on your landing pages.

Create description that best define your  page and search term.

Thanks Stephen, Since june I am using long tail keywords  and url as an anchor text. It's hard to find pr3 dofollow. I am working more in creating Infographics, and social media like facebook , twitter , stumble and pinterest.

We use http://uk.prweb.com/ its bit expensive but good value for money, and http://www.express-press-release.net/ which is cheaper then prweb.