Alexa Top

Alexa Top 500 is a great way to know which web-sites and services are more popular than other. People who install the plugin from Alexa into their browsers silently send data about pages their visit to Alexa servers. Alexa collect and process this data, so you can find that statistics here. Not surprisingly that the most popular site in the list is Google. Second and third positions in the list take accordingly Facebook and YouTube.