Facebook is the second most popular site in the world according to the three-month Alexa traffic rankings. Search engines refer approximately 6% of visits to it. This site has been online since 1997, and the time spent in a typical visit to Facebook is roughly 32 minutes, with 37 seconds spent on each pageview. Relative to the overall population of internet users, this site's audience tends to be users who browse from school and home; they are also disproportionately women under the age of 45.