While Facebook has started moving its employees to its new campus in Menlo Park, the Social Networking Company is already contemplating a second campus. The campus is to be built across the 57 acre site it procured from the Sun Microsystems for the new campus.

Facebook recently filed documents with the city that give a glimpse of the company's future plans.

The second campus, set on 22 acres, would be made up of five three- and four-story buildings with about 422,000 square feet of space, along with a five-story parking garage. It could house up to 2,800 workers.

Facebook is not planning to begin construction on the second campus until 2013, the San Jose Mercury News is reporting.

"While the locations of the buildings and the related infrastructure have been outlined, we are still working on the final design and are excited about the potential for the site," Slater Tow, a Facebook spokesman, said in an e-mail, writes SJM.

Facebook has completed renovations to one of the eight main buildings on the new campus, also known as the East campus. The construction work would continue throughout the year as Facebook workers continue to filter in from Palo Alto.The second campus planned by Facebook on the western side of the highway 84 would be connected to the former Eastern campus by an underground tunnel.The company, however, does not intend to start the construction of its Western campus until early 2013, but it was required to file its conceptual plans as a part of the environment review process for the entire complex.

To reflect the nature of Facebook’s “scrappy” culture, garages will be installed throughout the complex, representing “the startup garage” and the company has renamed the ring road around the East Campus "Hacker Way.”

The rapid expansion plan of Facebook is an indicator to the growth curve of a company whose Social Networking Site has more than 750 million members. The company has made a giant leap from its first team of 500 employees to its new 57 acre campus with the capacity of holding 3600 workers, and the next few years could see Signature Silicon Valley housing over 9000 employees.

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