About Facebook

Facebook is a social networking website that allows people to communicate with their friends and exchange information. Launched on February 4, 2004, Facebook was founded by Mark Zuckerberg, a former member of the Harvard class of 2006 and former Ardsley High School student. Initially the membership was restricted to students of Harvard College. It was subsequently expanded to other Boston area schools (Boston College, Boston University, Harvard, Northeastern University, Tufts University), Rochester, Stanford, NYU, Northwestern, and all Ivy League schools within two months. Many individual universities were added in rapid succession over the next year. Eventually, people with a university (e.g .edu, .ac.uk, etc.) email address from institutions across the globe were eligible to join. Networks were then initiated for high schools and some large companies. Since September 11, 2006, it has been made available to users with any email address, if they are within a certain age range. Users can select to join one or more participating networks, such as a high school, place of employment, or geographic region.

As of October 2007, the website had the largest number of registered users among college-focused sites with over 42 million active members worldwide and expects to pass 60 million users by the end of the year (also from non-collegiate networks). From September 2006 to September 2007 it increased its ranking from 60th to 7th most visited web site, and was the number one site for photos in the United States, ahead of public sites such as Flickr, with over 8.5 million photos uploaded daily.

The name of the site refers to the paper facebooks depicting members of the campus community that U.S. colleges and preparatory schools give to incoming students, faculty, and staff as a way to get to know other people on campus.