salam to all my dear friend.
Facebook ( www.facebook.com) is an online social networking directory that connects people with friends and others who work, study and live around them. People use Facebook to keep up with friends, upload an unlimited number of photos, share links and videos, and learn more about the people they meet.
Created and launched in February 2004 by Harvard students Mark Zuckerberg, Dustin Moskovitz and Chris Hughes, the site began as a network strictly for Harvard University. Two months later, the site expanded to include other Ivy League schools. After that, the college network slowly grew and by the end of 2004, Facebook had registered more than one million users.
Now open to anyone with a valid email address, the site includes members' pictures, biographies, interests and messages, and members can browse freely through open profiles. Members may choose their personal levels of security to prevent strangers from accessing their personal information.
The platform enables anyone, anywhere, to build complete applications that members can choose to use. Applications range from photo sharing to graffiti walls and everything in between.
The most popular social networking site. Founded in 2004 by Mark Zuckerberg, the site is free and derives revenues from ads. The name comes from the paper document issued to college freshmen to help them get acquainted on campus. Using the search facilities, members can locate other Facebook members and "friend" them by sending them an invitation, or they can invite people to join Facebook (see Faceslam). Facebook offers instant messaging and photo sharing, and Facebook's e-mail is the only messaging system many students ever use.
The "Wall" is an area of a member's Facebook page that others post messages to, and third-party applications support photos and videos.
Initially targeting Harvard students, Facebook was later opened to other universities and then high schools. In 2006, it allowed everyone to join and added a News Feed feature that would broadcast changes in members' pages to all Facebook users identified in their network of friends. It turned Facebook into a personalized social news service that by 2010 had 500 million members.
In 2007, Facebook introduced its application platform to developers. By 2010, more than a half million applications were available for business, education and entertainment. Games have been the most popular, and Facebook Credits were created to provide virtual money to spend while playing. See Facebook Platform.
Beacon Social Ads
In late 2007, Facebook introduced its Beacon social advertising program, which tracks Facebook users who visit advertisers' sites. Ads are then targeted to others indicating that their friend has purchased a product, rented a video or signed up for a service. The system was launched as opt-out in the beginning but later changed to opt-in. See social networking site, social advertising, opt-in and opt-out.