What is Page Rank?
Page Rank (PR) is a numeric value from 0-10 that Google assigns to your individual web pages, and it’s a measure of how important that page is.
Google determines this importance by looking at how many other high quality, relevant pages link to a particular page. The more links – and the better quality those links are – the more “votes” a page gets in terms of importance. And the more “votes” a site gets, generally the higher the PR.
How often does Google update Page Rank?
It used to be every 3 months but it’s becoming more and more erratic.
Does PR matter?
Yes and no. Originally PR was all that mattered in the search rankings but today that’s just not true since there are a myriad of other factors that Google considers when weighting who should appear where.
That said, high PR is always worth having just don’t obsess over it.
What is the "Google Dance"?
When “stuff” changes the SERPs fluctuate, sometimes wildly. One day your site could be number 1 and the next nowhere to be seen. One of the main contributing factors to that is how Google sees your backlinks (which you’re consistently building, right?).
Don’t obsess over it, just keep building and you’ll be fine.
How does Google personalize my results?
If you’re signed into Google, then Google keeps track of what search engine results you’ve clicked on. And even if you’re not signed in, Google keeps track of what results people who use your computer click on.
Over time, Google starts to detect a pattern. For example, if you seem to always click on Wikipedia results, then Google will start showing you more Wikipedia results. If you always click on health results from webmd.com, then you’ll get more webmd.com results when you run a health-related search.