Do you Facebook? An estimated 175 million peaple in the United State do, and almost half are college students. The immensely popular sosial networking website was started by Harvard sophomore Mark Zuckerberg in frebruary 2004 as a way for his classmates to network. The site proved to be so popullar that be quickly opened it up to other school. By November 2004, the site boasted 1 million users. A mere 18 months later,membershiop had balloned to 7 million members at 2100 college and 22000 high school. When it began accepting non-students in oktober 2006, memberships doubled from 12 million to 24 million in just 8 months. Today, Facebook.com is one of the most visited sites on the internet, running neck and neck with Google among U.S college students. The total number of worldwide Facebook users exceeds 1 billion, with more than half of them visiting Facebook daily.