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Mark Zuckerberg, a student of the Harvard University founded the networking site Facebook.com in 2004 to promote networking among the students of the university. Initially, only Harvard students were allowed to sign up for the site. Within a month of its launch, reportedly half of the total undergraduate students at Harvard had joined Facebook.com.
Further along, the restrictions to join the site were lifted and the members were allowed to organize their friends on the basis of location and school. Also, a high school version of the site was launched the same year.
Apart from other reasons, Facebook.com has also been famous for receiving huge sums of investment from various funding agencies and people, including Peter Thiel, the co-founder of PayPal, Accel Partners, Greylock Partners, Lia Ki-Shing, a Hong Kong based billionaire, and also Microsoft Corporation.