Facebook is a social networking service launched in February 2004, owned and operated by Facebook, Inc. As of September 2012, Facebook has over one billion active users, more than half of them using Facebook on a mobile device.

Users must register before using the site, after which they may create a personal profile, add other users as friends, and exchange messages, including automatic notifications when they update their profile.

Let's take a look at new headquarters of Facebook in California, United States.

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An employee rides a bicycle at the headquarters of Facebook in Menlo Park, California.

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A giant 'like' icon made popular by Facebook is seen at the company's headquarters in Menlo Park, California.

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An employee writes a note on the message board at the headquarters of Facebook in Menlo Park, California.

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Employees gather in their work environment for a discussion at the headquarters of Facebook in Menlo Park, California.

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Employees chat at the headquarters of Facebook in Menlo Park, California.

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An employee works in one of many 'cozies', tiny, personal conference rooms at the headquarters of Facebook in Menlo Park, California.

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Employees wait at the IT service desk at the headquarters of Facebook in Menlo Park, California.

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Employees gather in their work environment for a discussion at the new headquarters of Facebook in Menlo Park, California.

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An employee works on a computer at the headquarters of Facebook in Menlo Park, California.

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An employee works in the international user operations area at the headquarters of Facebook in Menlo Park, California.

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A sketch of founder and CEO Mark Zuckerberg is seen on a wall at the headquarters of Facebook in Menlo Park, California.

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An art and message board is seen in a hallway at the new headquarters of Facebook in Menlo Park, California.

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An employee walks through the cafeteria at the headquarters of Facebook in Menlo Park, California.

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A superman costume hangs at a telephone booth for private cell phone discussions at the headquarters of Facebook in Menlo Park, California.

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A painting at the Facebook headquarters in Menlo Park, California.

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Facebook logo at the headquarters in Menlo Park, California.

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People walk past a graphic on a wall at the Facebook headquarters in Menlo Park, California.

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Employees walk and cycle along a walking and bicycle path at the Facebook headquarters in Menlo Park, California.

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Facebook logo at the headquarters in Menlo Park, California.

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A shadow is cast beside a sign along a walking and bicycle path at the Facebook headquarters in Menlo Park, California.

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A piece of art work is pictured outside a meeting room at the Facebook headquarters in Menlo Park, California.

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Employees dine near a fire at an outdoor cafe at the Facebook headquarters in Menlo Park, California.

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Employees walk along a walking and bicycle path at the Facebook headquarters in Menlo Park, California.

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An employee walks near a telephone booth for private mobile phone discussions at the headquarters of Facebook in Menlo Park, California.