Alexa has just announced that it changed the formula used to rank websites. The formula now factors in data from other sources than the Alexa toolbar.
In recent months we've heard from our Alexa users that understanding Internet usage beyond Alexa Toolbar users was increasingly of interest. Ask and you shall receive!
We listened to your suggestions, and we believe that our new rankings system is much closer to what you asked for. We now aggregate data from multiple sources to give you a better indication of website popularity among the entire population of Internet users.
