[VIDEO] Personalized Search in Google
In late 2009, Google introduced the concept of personalized search results for all users. Previously, they’d only used personalized search for signed-in users.
This means that when you search using Google, the results that you receive will include the most relevant results possible based on a number of factors including previous search behavior. This addition to their search engine enables Google to customize search results for users based upon 180 days of search activity linked to an anonymous cookie in your browser.
Here is a short video from Google Engineers Bryan Horling and Robby Bryant offered by Posicionamiento web redescubierto: