Index pegs Facebook at $11.5B, Twitter at $1.4B

Facebook Inc. is worth almost 10 times as much as Twitter Inc., in the latest effort to place values on startups that haven’t gone public or been acquired.

SharesPost, a marketplace for trading in private companies, said that values of shares trading in Facebook peg its worth at $11.5 billion. That’s roughly the same value reported when Russian investors took a reported $300 million stake in the social networking company in December.

The index placed a value of $1.44 billion on the micro blogging success of Twitter, which is less than the $2.61 billion value it placed on Zynga Game Network Inc., the San Francisco creator of the popular Farmville game on Facebook.

Other companies with values estimated at more than $1 billion were professional networking company LinkedIn Corp. of Mountain View - $1.3 billion - and Palo Alto-based Tesla Motors - $1.28 billion.

Virtual world company Linden Labs was valued at $383 million and green construction supplier Serious Materials Inc. of Sunnyvale was valued at $227 million.
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