On Friday, December 4, 2009, Google announced that users will now be receiving personalized search results based off of their past usage. Before Friday’s updates to Google’s search engine, only users who were logged into their Google account were receiving personalized results based off their searches and browser web history. Now, even if you do not have a user account with Google, they will still automatically personalize your search based on the last 180 days of searches from your computer.

How Will This Affect SEO?

If your website has a legitimate, honest SEO campaign, you shouldn’t be affected in a negative way.  It is my personal opinion that it may even help pre-qualify visitors and improve your click through ratio.  Much remains to be seen, but this will be interesting to follow since Caffeine will also be launching in January 2010.  For those of you unfamiliar with Caffeine, it is Google’s entirely new search engine.

Lots of fun in 2010, so make sure your site is freshly optimized and you’re all working on your inbound link campaigns.

Google’s Blog Announcement