Woodside-based GSV Capital, a publicly traded investment fund, announced today that it has purchased 225,000 shares in Facebook for a total of $6.6M. The buy values Facebook at nearly $70 billion. GSV Capital said Facebook now represents about 15 percent of the company's total portfolio. Facebook is widely reported to be in the process of an IPO attempt. GSV Capital says its goal is to "identify and invest in the premier VC backed private companies in the marketplace today" at "attractive valuations."