PALO ALTO, Calif. (
shares have risen 42% over the past four months on exchanges for private companies, as membership of the site topped 300 million users and the company turned cash flow positive, says a report from
Shares of the social network are currently selling for about $21 each at SecondMarket, up from $14.77 in July, valuing the social networking site at $9.5 billion. According to
, the rise in the stock price could be a leading indicator of a potential initial public offering.
"The perception is that that the company is going to IPO, and it's going to be the next kind of Google IPO situation where you're going to have massive interest," Adam Oliveri, managing director of Second Market, told
. "Investors are coming out of the woodwork, trying to figure out a way to get exposure."