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.

• Facebook: $11.5 billion
• Zynga (includes Farmville): $2.6 billion
• Twitter: $1.4 billion
• LinkedIn: $1.3 billion
• Linden Labs (Second Life): $383 million

See more: http://www.bizjournals.com/sanjose/stories/2010/03/01/daily84.html

Prior to the launch of the SharesPost Index, there was no benchmark that reflected real-time market input on the value of venture-backed companies. By integrating the most relevant available data surrounding company value, including real-time transactions in the company’s shares, current posted indications of interest for future transactions, research report estimates and venture capital financing valuations, the SharesPost Index strengthens SharesPost’s leadership position as the source of valuation data and transaction information for venture-backed private companies.